Skip to main content
. Author manuscript; available in PMC: 2020 Sep 1.
Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2020 Feb 26;29(3):643–649. doi: 10.1158/1055-9965.EPI-19-0905

Table 3.

Difference in the mean of total cigarettes per day for the four VLNC conditions vs. NNC controls at the Week 6 visit among participants included in cigarette butt analysis.

Unadjusted Linear Regression1 Adjusted Linear Regression2
Treatment Group N Mean Difference (95% CI) p-value Mean Difference 5% CI) p-value
15.8 mg/g 64
5.2 mg/g 66 1.04 (−3.22, 5.29) 0.63 0.67 (−3.34, 4.69) 0.74
2.4 mg/g 51 −5.32 (−9.87, −0.77) 0.02 −5.91 (−10.19, −1.62) 0.007
1.3 mg/g 64 −4.56 (−8.84, −0.27) 0.04 −4.55 (−8.58, −0.51) 0.03
0.4 mg/g 62 −6.59 (−10.91, −2.27) 0.003 −7.33 (−11.42, −3.23) <0.001
0.4 mg/g HT 70 −4.61 (−8.81, −0.42) 0.03 −5.28 (−9.26, −1.3) 0.0096
1

Adjusted for baseline cigarettes per day

2

Adjusted for age, race, gender and salivary nicotine metabolite ratio