Table 1

Patterns of prevalence of abnormal scores on the SDQ conduct subscale over time

‘Abnormal’ score on SDQ at:			Unweighted number	Weighted number	Per cent of whole cohort with valid data
34 months	46 months	58 months	Unweighted number	Weighted number	Per cent of whole cohort with valid data
No	No	No	1557	1510	73.1
No	No	Yes	72	74	3.6
No	Yes	No	98	104	5
No	Yes	Yes	46	52	2.5
Yes	No	No	126	132	6.4
Yes	No	Yes	45	47	2.3
Yes	Yes	No	47	56	2.7
Yes	Yes	Yes	79	90	4.3
			2070	2065	100

Conduct scores ranged from 0 to 10, scores in the ‘abnormal’ range being ≥4 (www.sdqinfo.org/py/doc/c0.py).
SDQ, Strengths and Difficulties Questionnaire.