Results
Pain, fatigue, anxiety, pain, labor
In this clinical trial study 136 women consented to participate (see Fig. The CONSORT flow diagram of intervention in the three groupsMean score of maternal age, gestational age, fatigue and hunger in the three groups at the baselineΧ
*Χ
*Χ
*Χ
F = 10.48
*Χ
F = 9.11

Based on the results, the mean gestational age was homogeneous in the three groups and was not significant (According to Table However, the mean score of hunger and anxiety showed a significant difference in the three groups (The results of the McGill Pain Questionnaire (regarding mean scores of pain intensity) were not significantly different in the three groups at the baseline (It was reported that the mean total score of pain, based on the McGill questionnaire, was significant in the first stage of labor in the three groups, compared to that before the intervention (Mean scores of McGill pain score in the three groups**f = 202.31
*Χ
*Χ
*Χ
*Χ


The two-by-two comparison of the groups using Tukey's and Dunn(Bonferroni correction) multiple comparison tests showed that the pain intensity score in the first stage of labor was significantly different immediately after both the first and second interventions in the infrared belt and hot water bag groups, compared to that in the control group (Furthermore, pain intensity was significantly lower in the infrared belt group immediately after the first and second interventions than in the hot water bag and control groups (Based on the results obtained from the two-by-two comparison of the groups using Tukey's and Dunn(Bonferroni correction) multiple comparison tests, the pain intensity score in the first stage of labor was significantly different in the infrared group than in the control group (It was also reported that the intensity of pain at the end of the first stage of labor was significantly lower in the infrared belt and hot water bag groups than in the control group (The two-by-two comparison of the groups using Tukey's and Dunn(Bonferroni correction) multiple comparison tests showed that the mean total scores of McGill pain in the first stage of labor was significant in the infrared belt and hot water bag groups, compared to the control group, before the intervention (Additionally, the McGill total pain score in the first stage of labor was significantly lower in the infrared belt group than in the hot water bag and control groups (As reported in Table Result of analysis of covariance on the effect of intervention on pain intensity with control the confounder variables
The three groups had significant difference in terms of progression of labor in first (The majority of women participating in this study reported their satisfaction degree with the hot water bag and infrared belt as good (56.8%) and very good (86.0%), respectively and women participated in infrared belt group had more satisfaction. It is worthwhile to report that 76% and 51% of women recommended their intervention (infrared belt and hot water bag respectively) to others. Their reason in the infrared belt group was as: it has a fine and pleasant warmth (18%), It reduces the pain very much (8%) and reduces the pain (22%). In the hot water bag group, women`s reason was as: It makes good sense (22%) and it reduces the pain a little (27%).Also, the three group hadn`t significant difference in terms of 1 (