Table 3.

ORs and 95% CIs from logistic regression models of whether participants have ever smoked

	Model 1 (n=8734)	Model 2 (n=8734)	Model 3 (n=8734)	Model 4 (n=8367)
Health literacy
Adequate	Reference	Reference	Reference	Reference
Limited	1.174 (1.067 to 1.293)**	–	1.134 (1.026 to 1.254)*	1.096 (0.988 to 1.216)
General cognitive ability†	–	0.919 (0.874 to 0.967)**	0.936 (0.888 to 0.987)*	1.000 (0.945 to 1.057)
Age (years)	1.004 (1.000 to 1.008)	1.001 (0.996 to 1.006)	1.001 (0.996 to 1.006)	1.002 (0.996 to 1.007)
Sex
Female	Reference	Reference	Reference	Reference
Male	2.112 (1.929 to 2.313)***	2.077 (1.896 to 2.276)***	2.087 (1.905 to 2.288)***	2.150 (1.955 to 2.366)***
Age left full-time education
14 years or under	–	–	–	Reference
15–16 years	–	–	–	1.016 (0.880 to 1.172)
17–18 years	–	–	–	0.828 (0.690 to 0.994)*
19 years or older	–	–	–	0.693 (0.572 to 0.839)***
Occupational class
Managerial and professional	–	–	–	Reference
Intermediate	–	–	–	0.919 (0.810 to 1.041)
Routine and manual	–	–	–	1.204 (1.066 to 1.360)**

*p<0.05, **p<0.01, ***p<0.001.

†ORs (95% CIs) for general cognitive ability are the odds of reporting ever smoking for a 1 SD increase in general cognitive ability.