Table 3.

Mean Difference (95% CI) in Years of Smoking by Race/Ethnicity Stratified by Age at Participation, NHANES 1999–2012

Age at NHANES participation	N	Model 1	Model 2	Model 3	Model 4
Men
Age <48 y
White	515	0.0 (ref)	0.0 (ref)	0.0 (ref)	0.0 (ref)
Black	167	−0.1 (−1.4, 1.1)	−0.7 (−2.0, 0.7)	−0.1 (−1.3, 1.2)	0.3 (−1.1, 1.6)
Mexican American	225	0.4 (−1.2, 2.0)	−1.2 (−2.8, 0.3)	−1.0 (−2.5, 0.4)	−0.5 (−2.0, 1.1)
Age 48–62 y
White	674	0.0 (ref)	0.0 (ref)	0.0 (ref)	0.0 (ref)
Black	202	1.9 (0.1, 3.8)*	0.7 (−1.2, 2.5)	2.0 (0.2, 3.8)*	2.7 (0.8, 4.5)*
Mexican American	228	1.2 (−1.1, 3.6)	−1.5 (−3.8, 0.8)	−0.7 (−3.1, 1.8)	0.4 (−2.0, 2.8)
Age >62 y
White	996	0.0 (ref)	0.0 (ref)	0.0 (ref)	0.0 (ref)
Black	287	2.5 (0.6, 4.3)*	1.3 (−0.5, 3.1)	2.8 (0.9, 4.6)*	3.4 (1.5, 5.3)*
Mexican American	353	0.6 (−2.8, 4.0)	−1.3 (−4.5, 2.0)	−0.9 (−4.0, 2.2)	0.0 (−3.1, 3.2)
Women
Age <48 y
White	366	0.0 (ref)	0.0 (ref)	0.0 (ref)	0.0 (ref)
Black	110	1.4 (−0.4, 3.1)	0.8 (−0.9, 2.5)	1.6 (−0.1, 3.2)	1.8 (0.1, 3.5)*
Mexican American	102	0.5 (−1.0, 2.0)	−0.7 (−2.3, 1.0)	0.1 (−1.6, 1.7)	0.4 (−1.3, 2.0)
Age 48–62 y
White	481	0.0 (ref)	0.0 (ref)	0.0 (ref)	0.0 (ref)
Black	147	1.5 (−0.7, 3.8)	0.7 (-1.7, 3.0)	1.4 (−0.8, 3.6)	1.4 (−0.7, 3.6)
Mexican American	107	0.5 (−2.8, 3.8)	−1.4 (−4.9, 2.1)	−0.4 (−3.6, 2.8)	0.0 (−3.2, 3.1)
Age >62 y
White	675	0.0 (ref)	0.0 (ref)	0.0 (ref)	0.0 (ref)
Black	214	2.7 (0.4, 5.1)*	1.3 (−1.1, 3.7)	2.0 (−0.5, 4.6)	2.8 (0.1, 5.4)*
Mexican American	181	−5.7 (−9.5, −2.0)*	−8.4 (−12.2, −4.6)	−5.7 (−9.3, −2.2)*	−4.1 (−7.5, −0.6)*

CI = confidence interval; NHANES = National Health and Nutrition Examination Survey. Model 1 adjusted for age, and country of birth. Model 2 further adjusted for education. Model 3 further adjusted for age at smoking initiation. Model 4 further adjusted for intensity of smoking before quitting (number of cigarettes per day at time of quitting). Age cutoffs based on tertiles values from weighted distribution.

*p < .05 for t test.