Species richness.

Boxplots showing species richness of children’s drawings (n = 401) by school type. Black lines indicate the median values. Coloured boxes show the interquartile ranges (IQR). Whiskers extend to the largest and smallest values no further than 1.5*IQR. A: Animal species richness by school type. B: Plant species richness by school type. Bracket labelled with adjusted p value shows a significant difference between state and private schools after post-hoc analyses.