###### Key messages

What is already known on this subject?
======================================

-   Quick first aid can be life-saving by laypersons.

-   School children are able to learn some aspects of first aid.

-   Beginning first aid education in primary schools has been recommended.

What this study adds?
=====================

-   A 3- day training programme for children 7 years and older in Hungary was developed and evaluated. Children were tested prior to training, immediately after and at 4 months for knowledge and practical skills.

-   Children as young as 7 years are able to learn the theoretical basics of basic life support and can effectively carry out calling the ambulance service, using an automated external defibrillator, placing a patient in the correct recovery position and managing severe bleeding.

Introduction {#s1}
============

Bystanders can play an important role in the event of sudden injury or illness before professional help arrives. The willingness, frequency and quality of first aid provision is low worldwide but can be increased with effective training.[@R1] After being alerted to a situation where first aid is required, the emergency call dispatcher can encourage bystanders to act on their prior knowledge.[@R4]

Sometimes children are the first people to the scene of an emergency situation. According to a statement by the American Heart Association, cardiopulmonary resuscitation (CPR) training for school children is mandatory in the USA.[@R5] Cardiopulmonary resuscitation training for school children was endorsed in 2015 by the World Health Organization.[@R6] A published systematic review in 2013 collated the most effective methods for teaching CPR to children.[@R7]

According to De Buck *et al*, first aid education is broader than CPR training alone.[@R8] First aid training in early childhood can improve an individual's knowledge, skills and willingness to perform first aid in an emergency situation.[@R9] Eisenburger and Safar recommended that everybody, including children, should learn life-supporting first aid.[@R10] Children are able to call for help and give basic first aid after training.[@R11] However, it is unclear at what age students can learn the different aspects of first aid (including resuscitation).[@R13]

Commencing first aid education in early childhood can be beneficial even if intellectual and physical abilities usually present as a barrier to learning. Early training provides the basis for future training opportunities. The aim of the current study was to evaluate the effects of a 3-day first aid course for all primary school age groups (7--14 years). Our aim was to measure the children's first aid knowledge and skills before, immediately after and 4 months after training.

Methods {#s2}
=======

In this longitudinal cohort study we investigated the effectiveness of our first aid teaching programme.

Participants {#s2a}
------------

The first aid programme was delivered within the framework of 'The year of first aid'. All students (first to eighth grades) were required to participate in a 3-day training programme which was held between September 2015 and June 2016. After training, the children received a poster which summarised the tasks learnt. Children in this study were from an inner-city primary school located in Pécs, Hungary. Children who had not attended all three lessons or did not pass any of the tests were excluded from the study.

Training programme {#s2b}
------------------

Training consisted of three sessions (45 min each) on three consecutive weeks (one per week) with transfer of theoretical knowledge and practical skills about first aid. The following most urgent situations were addressed in the study: adult basic life support (BLS), using an automated external defibrillator (AED), handling an unconscious patient, managing severe bleeding and calling the ambulance. For this latter point, we measured children's ability to recall the correct telephone number of the local ambulance service (104 or 112 in Hungary) and to give necessary relevant information (location, nature of the emergency, number of victims, own telephone number). To test this as part of practical skills we described emergency situations and, for each of these situations, the children had to decide whether it was necessary to call the ambulance service (eg, mild nose bleeding vs unconscious patient). The teaching programme was adapted to the needs and abilities of all age groups. All of the instructors were paramedics. The training programme contained theoretical and 'hands-on training' components. The curriculum and the checklists are shown in online [supplementary appendix A](#SP1){ref-type="supplementary-material"}.

10.1136/emermed-2016-206284.supp1

###### Supplementary appendix A

Measurements {#s2c}
------------

We administered a questionnaire to the students before, immediately after and 4 months after the training course. The questionnaire used open-ended questions because we believe the answers to open questions better reveal actual knowledge than the results of multiple-choice tests (see online [supplementary appendix B](#SP2){ref-type="supplementary-material"}). Questionnaires in earlier studies contained only multiple-choice items and thus we developed the questionnaire ourselves. Children with lower levels of cognitive status (first and second graders) could receive questions aurally and give answers orally. In addition, children were tested in first aid scenarios before and immediately after teaching, and then re-tested 4 months later. We therefore measured both knowledge and practical skills. Completion of the questionnaire and practical measurements were performed on the same days.

10.1136/emermed-2016-206284.supp2

###### Supplementary appendix B

The sex, age, body height and weight of all children were recorded and their body mass index (BMI) calculated. Children used a 'code word' when they were measured so we could follow them anonymously for the entire programme duration (pre- and post-test). Based on the questionnaire, we documented whether participants had experienced previous first aid training.

To evaluate the CPR performance we used an AMBU Man W model with AMBU CPR Software (AMBU A/S, Baltorpbakken 13, DK 2750 Ballerup, Denmark). The programme recorded chest compression depth, frequency and rate, hand position, chest compression-ventilation rate, ventilation volumes and frequency, compression-relaxation rate and pause between each compression round during a continuous CPR scenario of 2 min duration. To teach and practice handling of the AED, we used a Lifepak1000 AED Trainer. 'Self-made wounds' (artificial wounds made using materials such as makeup and syrup) were made to simulate severe bleeding. The victims were other children or adult imitators in the scenarios.

Measurements were conducted in a private classroom. Other participants waited in another room.

First aid skills were scored by an instructor using checklists that were developed according to European Resuscitation Council (ERC) guidelines.[@R15]

Statistical analysis {#s2d}
--------------------

Statistical analysis was conducted using SPSS 22.0 (Statistics Package for Social Sciences, Chicago, IL, USA) statistical software. Descriptive statistics were performed (percentages, mean, SD). Categorical variables were presented as number (%) and were compared using the χ^2^ test or Fisher's exact test as appropriate. One-way ANOVA and t-test was applied to test the association between knowledge, skills (pre-test, post-test and after 4 months) and demographic characteristics (age, body weight and height, BMI, previous first aid experience). Pearson correlation analysis was applied to test CPR quality (chest compression depth and ventilation volume vs age, BMI, body weight and height). A p value of \<0.05 was considered to be statistically significant.

Ethical considerations {#s2e}
----------------------

Since this survey evaluated a first aid teaching programme, it did not lie within the mandate of the research ethics committees in Hungary and therefore no approval was needed according to Hungarian law and regulations. The participants, their parents and teachers received written and oral information prior to study commencement. They were informed of their right to withdraw at any time with no personal consequences. The children's parents gave written informed consent before their child entered the study.

Results {#s3}
=======

We recruited 607 children. Of these, 25 were excluded from the study because they did not attended all three lessons (13 children) or they did not pass at least one of the tests (12 children). There were therefore 582 study participants, between 7 and 14 years old, comprising 317 girls (54.5%) and 265 boys (45.5%); 75 (12.9%) of these students had previously attended first aid training. Demographic data are displayed in [table 1](#T1){ref-type="table"}.

###### 

Demographic data of the children (n=582)

  Class in school                 1 st             2nd              3rd              4th              5th              6th              7th              8th
  ------------------------------- ---------------- ---------------- ---------------- ---------------- ---------------- ---------------- ---------------- ----------------
  Participants (n)                84               81               82               73               80               69               55               58
  Previous first aid course (n)   6                5                14               10               12               20               2                6
  Mean age (years)                7 (7--8)         8 (8--9)         9 (9--10)        10 (10--11)      11 (11--12)      12 (12--13)      13 (13--14)      14 (14--15)
  Mean body weight (kg)           27 (17--45)      31 (19--47)      30 (20--47)      36 (25--46)      42 (26--60)      45 (30--65)      50 (33--70)      59 (35--76)
  Mean body height (cm)           128 (120--156)   135 (122--155)   139 (124--156)   145 (140--159)   153 (140--165)   157 (140--178)   163 (145--179)   169 (144--184)
  Mean body mass index            16 (11--19.2)    17 (11--19)      16 (11.8--23)    17 (12--19.7)    18 (12--23.6)    18 (13.3--23)    19 (15--23.1)    21 (15.7--25)

Range give in parentheses. Data are normally distributed.

Theoretical knowledge {#s4}
=====================

In almost all of the children the theoretical knowledge after training and at 4 months was significantly higher than pre-test ([table 2](#T2){ref-type="table"}).

###### 

Success rate (%) of correct answers of the theoretical measurements (based on the result of the questionnaire) (n=582)

  Topic                                    Activity                                                                 Pre-test (% success rate)   Post-test (% success rate)   After 4 months (% success rate)
  ---------------------------------------- ------------------------------------------------------------------------ --------------------------- ---------------------------- ---------------------------------
  Call the ambulance                       Correct telephone number                                                 79                          98\*                         87
                                           Give the location                                                        75                          99\*                         94\*
                                           Nature of the emergency                                                  73                          98\*                         94\*
                                           Give the number of victims                                               5                           42\*                         11
                                           Give their own phone number                                              3                           99\*                         22\*
  Basic life support (BLS)                 Correct examination time of breathing (10 s)                             17                          66\*                         40\*
                                           Correct chest compression frequency                                      17                          97\*                         74\*
                                           Correct chest compression rate                                           7                           73\*                         46\*
                                           Correct chest compression depth                                          7                           73\*                         54\*
                                           Correct ventilation frequency                                            12                          97\*                         61\*
  Automated external defibrillator (AED)   What is function of an AED?                                              14                          97\*                         75\*
  Unconscious patient                      Why necessary to examine unconscious patient before recovery position?   12                          77\*                         66\*
  Manage bleeding                          Lay the patient                                                          1                           51\*                         86\*
                                           Direct pressure to the wound                                             1                           52\*                         85\*
                                           Raise the injured extremity                                              29                          98\*                         84\*
                                           Call the ambulance service                                               30                          98\*                         47

\*p\<0.01 compared with the pre-test (χ^2^ test).

Our results showed that some children without previous first aid training had preliminary first aid knowledge from different sources (eg, media, parents).

The majority of children were able to give the correct ambulance phone number and location and type of emergency prior to training; the proportion improved immediately after the course and remained high at 4 months. The ability to perform the steps of BLS was very low (\<20%) prior to the course and improved significantly after the course. After 4 months this knowledge declined somewhat but remained significantly higher than the pre-test level. Theoretical knowledge about AED was low overall (14%) but improved post-test and remained significantly better at 4 months compared with the pre-test level. The proportion of children who knew how to approach an unconscious patient was 12% and rose after training (77%) and remained significantly higher at 4 months (66%). Management of bleeding also rose significantly after training and some aspects improved further at 4 months.

Practical skills {#s5}
================

In almost all of the practical skills the ability immediately after training and at 4 months was significantly higher than pre-test ([table 3](#T3){ref-type="table"}).

###### 

Success rate (%) of correct answers of the practical measurements (based on the scenarios) (n=582)

  Topic                                    Activity                                      Pre-test (% success rate)   Post-test (% success rate)   After 4 months (% success rate)
  ---------------------------------------- --------------------------------------------- --------------------------- ---------------------------- ---------------------------------
  Call the ambulance                       Correct telephone number                      79                          98\*                         88
                                           Give the location                             75                          98\*                         94\*
                                           Nature of the emergency                       73                          98\*                         93\*
                                           Give the number of victims                    5                           42\*                         11
                                           Give their own phone number                   3                           99\*                         22\*
  Basic life support (BLS)                 Correct assessment of responsiveness          2                           59\*                         36\*
                                           Shout for help                                0                           46\*                         23\*
                                           Correct assessment of breathing               1                           52\*                         38\*
                                           Call the ambulance                            6                           71\*                         53\*
                                           Correct hand position                         2                           90\*                         72\*
                                           Correct compression-ventilation rate (30:2)   0                           86\*                         68\*
                                           Correct ventilation technique                 0                           50\*                         34\*
  Automated external defibrillator (AED)   Correct electrode position                    35                          92\*                         75\*
                                           Follow the instructions                       34                          98\*                         70\*
                                           Deliver safety shock                          36                          92\*                         76\*
  Unconscious patient                      Correct assessment of consciousness           3                           55\*                         43\*
                                           Correct assessment of breathing               2                           68\*                         68\*
                                           Correct recovery position                     1                           74\*                         75\*
                                           Examination before recovery position          0                           57\*                         40\*
                                           Call the ambulance                            9                           82\*                         60\*
  Manage bleeding                          Lay the patient                               1                           59\*                         32\*
                                           Direct pressure to the wound                  3                           74\*                         46\*
                                           Raise the injured extremity                   0                           66\*                         36\*
                                           Call the ambulance                            15                          77\*                         58\*

\*p\<0.01 compared with the pre-test (χ^2^ test).

In the facilitated situation game, the number of participants who could decide whether it was necessary to call the ambulance before training, immediately after training and 4 months after training were 285 (49%), 530 (91%) and 512 (88%), respectively.

Correct use of an AED was not difficult for most of the children. Only a little more than 10% of the participants knew the function of an AED before training. However, approximately one-third of the participants knew the correct electrode position, followed the instructions correctly and could deliver a safety shock before training. AED ability rose from 35% pre-test to \>90% for the tested aspects after instruction and remained significantly higher than pre-test at 4 months.

Management of the unconscious patient rose substantially. Prior to training only 2% of participants could identify if a patient was breathing correctly; after training and at 4 months 83% and 74%, respectively, of the children could determine whether the patient did or did not have normal breathing. Children assessed the breathing of an unconscious patient more often than they did in the BLS scenario immediately after and 4 months after training. The reason for the greater willingness to assess breathing could be that the patient in the BLS scenario was a manikin whereas another child played the victim in the situation with the unconscious patient.

Management of bleeding also significantly improved after training and remained significantly higher than the pre-test level at 4 months.

[Table 4](#T4){ref-type="table"} shows the main results of practical skills in different age groups.

###### 

Success rate (%) of practical skills in different age groups of children in the pre-test, post-test and 4 months later (n=582)

  Children's age (years)                                                                                7       8       9       10      11      12      13      14
  ------------------------------------------------------------------------------- --------------------- ------- ------- ------- ------- ------- ------- ------- -------
  Knowledge of emergency number                                                   Pre-test              46      58      88      88      92      92      81      97
                                                                                  Post-test             92\*    98\*    100\*   100\*   100\*   100\*   100\*   100
                                                                                  4 months after test   85\*    89\*    81\*    89      80\*    92      98\*    98
  Call the ambulance scenario (necessary or not)                                  Pre-test              81      75      91      93      95      94      98      97
                                                                                  Post-test             81      79      94      96      95      96      100     97
                                                                                  4 months after test   81      78      90      86      92      89      100     97
  Correct assessment of breathing                                                 Pre-test              0       0       0       0       0       0       4       7
                                                                                  Post-test             43\*    49\*    49\*    58\*    53\*    58\*    60\*    57\*
                                                                                  4 months after test   37\*    49\*    32\*    27\*    31\*    41\*    44\*    48\*
  Assessment of breathing scenario (recognise normal, abnormal or no breathing)   Pre-test              41      46      43      62      74      74      81      83
                                                                                  Post-test             73\*    77\*    84\*    82\*    85      88\*    88      93\*
                                                                                  4 months after test   60\*    70\*    66\*    73      80      89\*    90      76
  Correct recovery position                                                       Pre-test              0       0       0       0       0       0       3       7
                                                                                  Post-test             56\*    70\*    77\*    80\*    72\*    85\*    83\*    85\*
                                                                                  4 months after test   55\*    67\*    72\*    64\*    87\*    90\*    85\*    97\*
  Correct AED electrode position                                                  Pre-test              18      16      19      27      31      51      53      64
                                                                                  Post-test             74\*    86\*    96\*    99\*    97\*    99\*    98\*    98\*
                                                                                  4 months after test   62\*    67\*    71\*    77\*    81\*    83\*    90\*    85\*
  Follow the instructions of the AED                                              Pre-test              15      19      17      29      35      53      53      65
                                                                                  Post-test             94\*    93\*    100\*   100\*   100\*   100\*   100\*   98\*
                                                                                  4 months after test   61\*    52\*    61\*    76\*    76\*    79\*    81\*    91\*
  Deliver safety shock with the AED                                               Pre-test              18      19      17      29      35      53      53      65
                                                                                  Post-test             86\*    88\*    92\*    96\*    93\*    93\*    96\*    97\*
                                                                                  4 months after test   64\*    67\*    77\*    71\*    77\*    85\*    83\*    93\*
  Direct pressure to the wound to manage severe bleeding                          Pre-test              0       0       1       3       3       7       5       9
                                                                                  Post-test             100\*   100\*   100\*   100\*   99\*    100\*   100\*   100\*
                                                                                  4 months after test   80\*    82\*    77\*    71\*    66\*    61\*    77\*    88\*

\*p\<0.01 compared with pre-test within age groups (χ^2^ test).

Only a few children from the 13--14-year-old age group could assess breathing correctly before training but approximately one-half and one-third of all age groups could assess breathing correctly immediately after and 4 months after training, respectively.

Only a few children from the 13--14-year old age group were able to place the patient in the recovery position before training. Approximately three-quarters of the children were able to establish the correct recovery position immediately after training and 4 months after training (more than half of the 7-year-old children). Only children \>10 years of age could place the adult patient in the recovery position alone after the test and 4 months later (because of their better physical abilities). Other children solved the problem by working in groups.

Effect of age, sex and prior training {#s6}
=====================================

The effect of predictor variables are displayed in [table 5](#T5){ref-type="table"}.

###### 

Effect of age, sex and prior training

  Topic                                    Test                  Age (p values)   Sex (p values)   Prior training (p values)                    
  ---------------------------------------- --------------------- ---------------- ---------------- --------------------------- ------- -------- --------
  Call the correct ambulance number        Pre-test              \<0.001\*        \<0.001\*        0.555                       0.852   0.015‡   0.023‡
                                           Post-test             0.092            0.075            0.459                       0.947   0.873    0.476
                                           4 months after test   0.123            0.224            0.416                       0.803   0.203    0.171
  Correct assessment of breathing          Pre-test              \<0.001\*        \<0.001†         0.918                       0.413   0.488    0.582
                                           Post-test             0.163            0.392            0.746                       0.252   0.899    0.863
                                           4 months after test   0.421            0.376            0.095                       0.733   0.120    0.773
  Correct recovery position                Pre-test              0.03\*           \<0.001†         0.122                       0.478   0.927    0.384
                                           Post-test             0.206            0.374            0.062                       0.692   0.482    0.402
                                           4 months after test   0.708            0.289            0.991                       0.127   0.644    0.902
  Automated external defibrillator (AED)   Pre-test              \<0.001†         \<0.001\*        0.067                       0.567   0.122    0.915
                                           Post-test             \<0.001†         0.432            0.107                       0.786   0.382    0.634
                                           4 months after test   \<0.001†         \<0.001\*        0.997                       0.385   0.292    0.701
  Manage severe bleeding                   Pre-test              \<0.001\*        \<0.001\*        0.466                       0.312   0.041‡   0.121
                                           Post-test             0.211            0.444            0.947                       0.274   0.245    0.700
                                           4 months after test   0.158            0.137            0.205                       0.285   0.312    0.302

Sex and prior training were compared with correct answers using the χ^2^ test. Ages were compared with correct answers using ANOVA and t-test.

\*Statistically significant difference between 7--8-year-olds and older children (ANOVA and t-test).

†Statistically significant difference between 13--14-year-olds and younger children (ANOVA and t-test).

‡Statistically significant difference between children with and without prior training (χ^2^ test).

The children's sex was not associated with any of the pre-test results. However, age was associated with knowledge of correct emergency number, correct assessment of breathing, correct recovery position, correct use of the AED and managing severe bleeding, and previous training was associated with knowledge of the correct emergency number and bleeding management (raising the injured extremity, applying direct pressure to the wound) in the pre-test. Immediately after and 4 months after training none of these variables remained associated, except the knowledge about AED (13--14 years vs younger children; p\<0.001) and the correct practical use of the AED (7--8 years vs older children; p\<0.001).

Effectiveness of CPR {#s6a}
--------------------

The effectiveness of CPR (chest compression and ventilation) in different age groups with AMBU CPR Software was only detected once, immediately after training ([table 6](#T6){ref-type="table"}).

###### 

Effectiveness of chest compression and ventilation measured with AMBU CPR Software (n=582)

  Children's age (years)                           7               8               9               10              11               12              13              14
  ------------------------------------------------ --------------- --------------- --------------- --------------- ---------------- --------------- --------------- ---------------
  Participants (n)                                 84              81              82              73              80               69              55              58
  Mean depth of chest compression (mm)             22 (12--56)     26 (12--56)     36 (12--68)     44 (30--59)     41 (25--52)      51 (29--71)     55 (35--71)     58 (38--75)
  Correct depth of chest compression (%)           7               11              15              42              39               68              68              74
  Mean frequency of chest compression/min          122 (59--158)   121 (59--158)   121 (58--158)   132 (96--155)   127 (110--153)   128 (97--163)   139 (98--159)   123 (99--151)
  Correct frequency of chest compression (%)       28              27              29              10              33               28              35              42
  Correct compression-relaxation rate (%)          9               17              17              20              22               37              58              68
  Correct hand position of chest compression (%)   62              65              69.3            90              78               79              71              86
  Compression pause (s)                            11 (0--12)      9 (0--13)       4 (0--30)       10 (0--20)      8 (0--26)        9 (0--22)       11 (7--21)      8 (7--19)
  Correct compression-ventilation rate (%)         23              25              37              55              54               62              76              81
  Mean ventilation volume (L)                      0               0               0.05 (0-1)      0.23 (0--0.8)   0.02 (0--0.3)    0.3 (0--1.2)    0.3 (0--1)      0.4 (0--1.5)
  Correct ventilation volume (%)                   0               0               1.7             30              0                21              26              34

Range given in parentheses. Data are normally distributed.

There was a significant correlation between chest compression depth and children's age (r=0.604; p\<0.001), body weight (r=0.645; p\<0.001), body height (r=0.605; p\<0.001) and BMI (r=0.373; p\<0.001). Children in the 12--14-year-old age group performed significantly better chest compressions than younger children (p\<0.001). Ventilation volume correlated significantly with children's age (r=0.395; p\<0.001), body weight (r=0.374; p\<0.001), body height (r=0.372; p\<0.001) and BMI (r=0.18; p=0.002). There was no significant correlation between chest compression depth (p=0.1), ventilation volume (p=0.618) and children's sex. Correct hand position was not dependent on BMI (p=0.368), age (p=0.213) and sex (p=0.17). The compression-ventilation ratio was also not dependent on BMI (p=0.923), age (p=0.06) and sex (p=0.584). Children who previously learnt first aid compressed the chest significantly deeper (p=0.018) but ventilated the manikin to a similar volume as the group without previous first aid training (p=0.308). The applied compression-ventilation ratio was independent of previous first aid training (p=0.619).

Discussion {#s7}
==========

The main result of our study is that children as young as 7 years are able to learn basic first aid activities including calling the ambulance service, starting CPR, using an AED, handling an unconscious patient and managing severe bleeding. After the 3-day first aid programme and 4 months after training, most of the skills were significantly better than before training in all age groups.

In our study, children aged 7 years performed worse than older children, but their scores increased significantly immediately after and 4 months after training compared with the pre-test. Overall, more than half of the 7-year-old children correctly performed all of the topics (except correct assessment of breathing) immediately after training.

Only children \>10 years of age could place the adult patient in the recovery position alone because of their better physical abilities. Only a few children in the 13--14-year-old age group were able to assess breathing correctly and place the patient in the recovery position before training. These scores were significantly better immediately after and 4 months after training.

We measured both CPR knowledge and CPR practical skills of all participants. A significant correlation was found between chest compression depth and children's age, weight, height and BMI. Only one-tenth of participants were able to effectively ventilate the patient. The quality of ventilation correlated significantly with the children's age, weight, height and BMI. Children aged \<10 years could not perform effective CPR because of their physical abilities but were able to learn the cognitive parts of BLS as well as older children. BMI and other physical factors did not influence knowledge and cognitive skills. Completely following the guidelines is difficult for these children (eg, the full process of BLS).

The main benefit of this study was that all age groups of primary school children (7--14 years) were tested before, immediately after and 4 months after training. Some previous studies used questionnaires to evaluate the level of knowledge[@R17] and other studies measured practical skills through observation.[@R11] We used both of these methods. A 6-year longitudinal study used multiple-choice tests and observation but measured only children's CPR skills.[@R20]

Previous studies showed that young primary school children are able to call for help and give basic first aid.[@R11] In a previous study, nearly 50% of 12--14-year-old children could use the AED without formal training.[@R21] Our results were similar. Belgian Red Cross-Flander's evidence-based recommendation supports AED training for children.[@R22] Previous studies showed similar outcomes for handling an unconscious patient: 86% of 6--7-year-old children and 40% of 4--5-year-old children performed a correct recovery position after training.[@R11]

In our study the effectiveness and properties of chest compression and ventilation were similar to those of previous studies.[@R12] Teaching ventilation to children is difficult. However, the most important part of CPR is continuous chest compression. The ERC resuscitation guidelines suggest that, if bystanders are untrained or unable to perform rescue breathing, they should give chest compression only.[@R15] According to previous studies, CPR training should start at the age of 10 years.[@R10] Based on our results, we believe that teaching BLS under the age of 10 years can be useful. The majority of these children cannot perform effective CPR but they can learn some aspects of resuscitation (eg, assessment of breathing, correct hand position).

Limitations {#s8}
===========

Our study might not be representative of the whole population of primary school children in Hungary. Children were re-tested after 4 months of training, but we do not know the longer-lasting effects of training. A follow-up study in the future could help to measure long-term knowledge and skill retention. The actual reaction of these children in a possible real emergency situation remains unknown. Despite these limitations, the results from our study are promising.

Conclusions {#s9}
===========

Many people requiring medical aid in emergency situations die because first aid is not performed. The main reason given by people for 'doing nothing' is the preconceived notion that they will make mistakes if trying to help in such situations.

Beginning first aid education in the first grade of primary school (7 years of age) should be mandatory. These children can learn the basic aspects of first aid. The first aid teaching programme should include the transfer of knowledge and should also motivate children to perform first aid and develop their helping aptitude.

10.1136/emermed-2016-206284.supp3

###### Suplementary file 1

The authors would like to thank all the children, their parents and teachers for participation in the study. The authors thank the Ministry of Human Resources (Hungary) who supported the Open Access publication of this manuscript, based on the 'National Talent programme'.

**Contributors:** BB and JB contributed to study conception and study design, data collection, interpretation and preparation of the manuscript. AP and EP contributed to interpretation of data and revision of the manuscript. HCS contributed to study design and revision of the article. All authors have read and approved the manuscript for publication.

**Funding:** This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

**Disclaimer:** This abstract has been translated and adapted from the original English-language content. Translated content is provided on an \"as is\" basis. Translation accuracy or reliability is not guaranteed or implied. BMJ is not responsible for any errors and omissions arising from translation to the fullest extent permitted by law, BMJ shall not incur any liability, including without limitation, liability for damages, arising from the translated text.

**Competing interests:** None declared.

**Patient consent:** It was not necessary because it was a first aid training programme for children.

**Provenance and peer review:** Not commissioned; externally peer reviewed.
