Fig. 1

Descriptive statistics for non-PBL schools, PBL schools and all schools (mean, median, SD and N) for the measures used in the analyses. Means are compared using t tests, allowing for different variances, with significant values indicated in bold (p < 0.05). Significant differences are also shown in colour, red indicating the group with the numerically higher score and green the lower scores. Note that higher scores do not always mean better