Table 1.

Summary statistics for baseline SDQ scores at 81 months, and comparisons with ONS Child Mental Health Study (Meltzer et al. 2000)

		Present study sample			ONS study (5-10 year old children)
Variable	Binomial cut-off	n	Mean (SD)	n (%) with behavioural problems	n	Mean (SD)
Total difficulties	≥14	7649	7.5 (4.8)	847 (11)	5855	8.6 (5.7)
Hyperactivity	≥6	7678	3.4 (2.4)	1400 (12)	5855	3.6 (2.7)
Emotional symptoms	≥4	7685	1.5 (1.7)	988 (13)	5855	1.9 (2.0)
Conduct problems	≥3	7691	1.6 (1.5)	1845 (24)	5855	1.6 (1.7)
Peer problems	≥3	7684	1.1 (1.4)	1088 (14)	5855	1.4 (1.7)
Pro-social behaviour	≤5	7690	8.2 (1.8)	742 (10)	5855	8.6 (1.6)