Table 3 Odds ratios (95% confidence intervals) for the relation of a 1 SD increase in mental ability score at the age of five years with risk factors for premature mortality at the age of 30 years (N  =  8203).

	N (%)	Adjustment†
		Sex	Childhood social class	Current social class	Academic/ vocational qualifications	Annual gross earnings‡	Multiple
Current smoker	2994 (36.5)	0.86 (0.82 to 0.90)	0.89 (0.85 to 0.93)	0.95 (0.91 to 0.99)	1.00 (0.95 to 1.04)	0.92 (0.87 to 0.97)	1.07 (1.01 to 1.14)
Ever smoked	4571 (55.7)	0.95 (0.90 to 0.99)	0.96 (0.92 to 1.01)	1.02 (0.98 to 1.07)	1.08 (1.03 to 1.14)	0.99 (0.94 to 1.04)	1.11 (1.05 to 1.18)
Given up smoking	1577 (34.5)	1.23 (1.16 to 1.31)	1.19 (1.12 to 1.27)	1.13 (1.06 to 1.21)	1.11 (1.04 to 1.19)	1.15 (1.06 to 1.21)	1.02 (0.94 to 1.11)
Overweight*	3295 (41.7)	0.89 (0.84 to 0.93)	0.88 (0.82 to 0.95)	0.92 (0.88 to 0.96)	0.93 (0.89 to 0.98)	0.88 (0.83 to 0.93)	0.93 (0.88 to 0.99)
Obese*	888 (11.3)	0.84 (0.79 to 0.91)	0.88 (0.82 to 0.95)	0.88 (0.81 to 0.94)	0.92 (0.85 to 0.99)	0.88 (0.81 to 0.96)	0.96 (0.87 to 1.05)
High blood pressure	635 (7.7)	0.91 (0.83 to 0.99)	0.93 (0.86 to 1.01)	0.92 (0.84 to 0.99)	0.95 (0.87 to 1.03)	0.98 (0.88 to 1.08)	1.01 (0.91 to 1.13)
Diabetes	73 (0.9)	0.97 (0.77 to 1.23)	0.96 (0.75 to 1.22)	0.96 (0.75 to 1.22)	1.01 (0.79 to 1.29)	1.00 (0.73 to 1.34)	0.91 (0.65 to 1.28)

*Data on body mass index were available for a subset of 7894 study participants.

†Odds ratios are individually adjusted for the covariate shown. The multiply adjusted model contains all covariates in the table.

‡Characteristics according to earnings are based on a subset of 6036 participants with these data.