Table 2.

Ordinary least squares regression models predicting smoking duration in middle age.

Predictor variables	Smoking duration in years, Model 1	Smoking duration in years, Model 2	Smoking duration in years, Model 3	Smoking duration in years, Model 4
Parents smoked in 1968	4.32** [1.16, 7.47]	3.83* [0.67, 6.99]	2.97 [−0.23, 6.17]	3.06 [−0.13, 6.25]
Male		−0.72 [−3.74, 2.29]	−0.95 [−3.88, 1.97]	−1.22 [−4.10, 1.67]
Agea		2.55** [1.00, 4.10]	2.54** [1.01, 4.08]	2.62** [1.10, 4.13]
Race (White reference)
Black		0.80 [−2.46, 4.05]	−0.38 [−3.82, 3.07]	−0.77 [−4.21, 2.67]
Other		1.60 [−5.85, 9.04]	1.03 [−5.75, 7.81]	0.43[−6.35, 7.20]
Marital Status (Partnered reference)
Single		0.76 [−3.46, 4.99]	0.98 [−3.36, 5.32]	−1.31 [−5.84, 3.22]
Widowed/Divorced/Separated		2.89 [−0.49, 6.27]	2.46 [−0.86, 5.78]	0.52 [−3.01, 4.06]
Education (Less than high school reference)
High School Graduate			−1.87 [ −7.45, 3.71]	−0.71 [−6.45, 5.03]
Some College			−4.47 [−10.36, 1.42]	−2.97 [−9.19, 3.26]
College+			−8.63** [−15.21, −2.04]	−6.09 [−12.95, 0.78]
Income Quartile
2nd				−1.35 [−5.56, 2.87]
3rd				−2.95 [−7.57, 1.66]
4th				−5.65* [−10.22, −1.08]
Constant	23.84*** [21.25, 26.42]	23.11*** [19.90, 26.33]	27.79*** [21.56, 34.02]	29.61*** [23.30, 35.92]
N	505	505	505	505

Note: Models with gradual adjustment for sociodemographic characteristics using the Panel Study of Income Dynamics cohort born between 1958 and 1968 interviewed in middle age. 95% confidence interval in parentheses. Survey weights applied. A Z-score standardized for interpretability. Boldface indicates statistical significance (p<0.05).

^*<0.05

^**<0.01

^***<0.001.