Table 6 Cronbach’s alpha coefficients for SDQ scores of Japanese children aged 7–15 years

From: Normative data and psychometric properties of the strengths and difficulties questionnaire among Japanese school-aged children

SDQ	Parent rating (n = 24,519)			Teacher rating (n = 7,977)
SDQ	Boys	Girls	Total	Boys	Girls	Total
Total difficulties score	.82	.79	.81	.86	.84	.86
Emotional symptoms	.64	.65	.64	.72	.72	.72
Conduct problems	.56	.50	.54	.69	.62	.67
Hyperactivity/inattention	.78	.73	.76	.85	.75	.84
Peer problems	.62	.54	.59	.70	.64	.68
Prosocial behavior	.72	.71	.73	.84	.82	.84

Note. SDQ, strengths and difficulties questionnaire.

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