Table 6.

Statistical tests used in the included studies.

Study	Statistical test
Minkoff and Axelrod [99]	ANOVA, t-test, Spearman's rank correlation coefficient
Nagata et al. [100]	Mann-Whitney U test Chi-square/Fisher's exact probability test
Schiff et al. [101–103]	ANOVA t-test
Silverman et al. [104]	ANOVA
Sowinski et al. [105]	t-test