Fig. 3From: Gender-specific differences in hypothalamus–pituitary–adrenal axis activity during childhood: a systematic review and meta-analysisForest plots of gender differences per subgroup. a Salivary cortisol (nmol/L) <8 years of age. b Salivary cortisol (nmol/L) 8–18 years of age. c Serum cortisol (nmol/L) <8 years of age. d Serum cortisol (nmol/L) 8–18 years of ageBack to article page