. Author manuscript; available in PMC: 2023 Apr 11.

Published in final edited form as: J Epidemiol Community Health. 2010 Jan;64(1):82–88. doi: 10.1136/jech.2009.089334

Table 3.

Adjusted ORs of conduct-only, hyperactivity–inattention-only and co-occurring problems by maternal smoking status, with children having neither problem behaviour as reference group

	Never smoked	Quit smoking	Light smoker	Heavy smoker
	Never smoked	OR (95% CI)	OR (95% CI)	OR (95% CI)
Boys
Conduct-only	Ref	1.14 (0.71 to 1.85)	1.44 (0.92 to 2.26)	1.92 (1.29 to 2.86)^**
Hyperactivity-only	Ref	0.89 (0.62 to 1.26)	1.79 (1.27 to 2.51)^**	1.64 (1.10 to 2.46)^***
Co-occurring	Ref	1.07 (0.67 to 1.71)	1.32 (0.84 to 2.07)	1.76 (1.05 to 2.94)^***
Girls
Conduct-only	Ref	0.89 (0.53 to 1.51)	1.73 (1.14 to 2.61)^**	1.73 (1.06 to 2.83)^***
Hyperactivity-only	Ref	1.23 (0.88 to 1.72)	1.35 (0.96 to 1.91)	1.39 (0.95 to 2.04)
Co-occurring	Ref	0.26 (0.08 to 0.82)^***	0.69 (0.26 to 1.84)	1.05 (0.51 to 2.16)

Differences statistically significant at **p<0.01, ***p<0.05.