Fig. 5 in Fig. 1 in Positive association between PTN polymorphisms and schizophrenia in Northeast Chinese Han population.

Fig. 5. Variation of analysed environmental predictors using box and whisker plots. Letters above boxplots indicate homogeneous/heterogeneous groups (Kruskal-Wallis test followed by Dunn post hoc texts). The central line of each boxplot refers to the median value, the box delineates the first and third quartiles, whiskers refer to the non-outlier values and asterisks indicate outliers.