Table 1

 Characteristics of children studied

Number of children 0–2 years exposed (%) (n = 2409)Number of children 3–11 years exposed (%) (n = 7926)
Maternal education
No qualifications326 (13.5)1200 (15.1)
Lone parenthood
Yes557 (23.1)2194 (27.9)
Household hardship
Severe326 (13.5)976 (12.3)
Maternal smoking
Current870 (36.1)2641 (33.3)
Sex of children
Male1263 (52.4)4098 (51.7)
Female1146 (47.6)3818 (48.3)
Dependent children
1870 (36.1)1258 (15.9)
2930 (38.6)3712 (46.8)
>2609 (25.3)2956 (37.3)