Figure 2
From: Birth order and prosociality in the early adolescent brain
Amygdala volumetric correlates (Study IIa). (a) Histograms of adolescents’ age at MRI scanning, socioeconomic status, and parental age at the Tokyo TEEN Cohort (TTC) survey in each sibling status group are shown. (b, c) The means and standard deviations of the Strengths and Difficulties Questionnaire (SDQ) prosocial behavior (PB) score (b) and total amygdala volume (c) in each sibling status and sex group are illustrated (*: Bonferroni-corrected p < 0.05). (d) Total amygdala volume and the SDQ PB score are positively correlated. (e, f) The mediation effects (e) and sex-moderated mediation effects (f) of the pathways from sibling status to the SDQ PB score via the total amygdala volume are shown. (g) The gray matter volume in the drawn region (basolateral amygdala) is significantly positively correlated with the SDQ PB score. The analyses were adjusted for age, sex, intracranial volume (the first and second panels), additionally for socioeconomic status (the third panel), and additionally for parental age (the fourth panel).
