Fig. 3

Students’ satisfaction with lectures. Students’ satisfaction evaluated by a 5-point rating scale is presented as follows: A overall satisfaction, B satisfaction grouped by topics taught by the same teachers (topics 4–8 and 10 in Table 1), and C satisfaction grouped by topics taught by different teachers (topics 1–3 and 9 in Table 1). Data are presented by box-and-whisker plots using the Tukey method [boxes indicating an interquartile range (IQR), whiskers indicating 1.5 times IQR, lines in the box indicating the median, and plus sign in the box indicating mean]. Differences in satisfactory levels between academic years in A and B were analysed by unpaired t test