Table 3. Correlation of age with scores on the parent-rated Strengths and Difficulties Questionnaire (SDQ) for male and female schoolchildren from 8 provinces in China.

Subscales	Correlation with age among boys (n=11,863)			Correlation with age among girls (n=10,245)
	r	p		r	p
Emotional symptoms	0.019	0.041		0.024	0.013
Conduct problems	-0.005	0.612		-0.022	0.023
Hyperactivity/Inattention	-0.100	<0.001		-0.113	<0.001
Peer relationship problems	0.075	<0.001		0.075	<0.001
Total difficulties	-0.013	0.154		-0.020	0.040
Prosocial behavior	0.016	0.081		0.028	0.004