Figure 3

Effect of group size on hands-on time, questions, unrelated conversation and tutor interventions. Graphical representation of teaching observations during the BLS training session for groups of three (X3), five (X5) and eight students per tutor (X8). Tukey box-and-whisker plots contain the median and represent the lower and upper quartile. A. Students in groups of eight participants per tutor had less hands-on time. B. The amount of question/answer-dialogs decreased in larger groups. C. Groups with five and eight students each conducted more unrelated conversations than groups of three students per tutor. D. The teaching interventions by a tutor (e.g. correcting a wrong hand placement during chest compression) did not differ between the different groups.