Sample size calculation and randomization
A pilot study was carried out among 20 paramedic nurse students to estimate baseline mean values and standard deviations in the classroom teaching, podcast or vodcast groups. For sample size calculation (The percentage of dropouts was estimated to be 30–40% after both the baseline and final tests, resulting in a need to recruit 40 students for each teaching group.The students were randomized into four equally sized teaching method groups using a computer program (