. 2018 Oct 20;21(3):278–284. doi: 10.1093/ntr/nty222

Table 2.

Linear Regression Models for Change in the Number of Cigarettes Smoked per Day at 6, 12, and 18 Months With Baseline Group and Cessation Interest Included in All Models; Adjusted for Significant Sociodemographic Covariates

	6 mo		12 mo		18 mo
	Change (95% CI)	p value	Change (95% CI)	p value	Change (95% CI)	p value
Baseline group		.148^a		.313^a		.283^a
Cigarette smoker	−2.07 (−2.71% to −1.43%)		−2.78 (−3.43% to −2.12%)		−3.07 (−3.90% to −2.24%)
Dual user	−3.41 (−5.11% to −1.71%)		−3.75 (−5.53% to −1.97%)		−4.21 (−6.22% to −2.20%)
Cessation interest (slope)	−0.06 (−0.26% to 0.14%)	.554	−0.21 (−0.41% to 0.00%)	.0497	−0.12 (−0.35% to 0.11%)	.310
Gender				.025^a		.018^a
Male	—		−3.97 (−5.17 to −2.77%)		−4.48 (−5.86% to −3.09%)
Female	—		−2.56 (−3.63 to −1.49%)		−2.81 (−4.07% to −1.55%)
Age (slope)	—		—		−0.06 (−0.11% to −0.01%)	.019^a
Education						.019^a
Less than high school	—		—		−2.85 (−4.88% to −0.81%)
GED/high school	—		—		−5.05 (−6.48% to −3.63%)
At least some college	—		—		−3.03 (−4.24% to −1.82%)

CI = confidence interval, GED = General Education Development.

^a p value for comparison between groups.