Table 2.

Association Between Quitting Smoking and Spousal Smoking Status in the Atherosclerosis Risk in Communities Study, 1986–1998

Model by Spousal Smoking Status	Wife Quitting (n = 1,875)		Husband Quitting (n = 2,980)
	OR	95% CI	OR	95% CI
Spouse current smokera
Unadjusted	0.50	0.42, 0.61	0.38	0.33, 0.44
Age- and study center–adjusted	0.51	0.42, 0.62	0.35	0.29, 0.43
Multivariable adjustedb	0.55	0.44, 0.69	0.37	0.30, 0.46
Adjusted for spouse's CHD statusc	0.54	0.43, 0.68	0.37	0.29, 0.46
Spouse former smokera
Unadjusted	1.23	1.05, 1.45	0.96	0.85, 1.08
Age- and study center–adjusted	1.23	1.04, 1.45	1.02	0.86, 1.19
Multivariable adjustedb	1.26	1.04, 1.53	1.03	0.85, 1.24
Adjusted for spouse's CHD statusc	1.26	1.04, 1.53	1.02	0.85, 1.24

Abbreviations: CHD, coronary heart disease; CI, confidence interval; OR, odds ratio.

^a The comparison group is subjects whose spouses never smoked.

^b Risk factors are age, race, education, alcohol use, income, center, time-varying hypertension, body mass index (weight (kg)/height (m)²), and CHD.

^c Further adjusted for spouse's time-varying CHD history .