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. Author manuscript; available in PMC: 2014 Jun 1.
Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2013 Apr 19;22(6):1015–1024. doi: 10.1158/1055-9965.EPI-12-1439

Table 1.

Baseline demographics and smoking history of subjects by treatment group (N=235).1

Overall VLNC NP VLNC+NP

Age (years) 47.0±11.7 46.5±12.2 47.3±11.0 47.0±11.9
Female 57.9% 59.5% 57.5% 56.6%
Non-Hispanic Whites 82.0% 85.9% 84.8% 75.0%
Education
    8th grade or less 0.9% 2.6% 0.0% 0.0%
    Some high school 2.6% 3.9 1.3% 2.7%
    High school graduate 22.8% 18.0% 26.3% 24.0%
    Some college/2-year 56.7% 53.9% 58.8% 57.3%
    College graduate 13.7% 18.0% 11.3% 12.0%
    Graduate 3.4% 3.9% 2.5% 4.0%
Marital Status
    Never Married 26.8% 25.3% 28.9% 25.3%
    Currently Married 38.7% 41.8% 36.3% 41.8%
    Currently Not Married 34.5% 32.9% 35.0% 32.9%
Cigarettes per day 18.9±7.2 19.4±6.2 19.5±8.6 17.7±6.3
Duration of having smoked at this rate (yrs) 29.1±12.0 29.2±11.6 29.6±11.7 28.4±12.8
Age becoming a regular smoker (yrs) 17.9±4.6 17.3±3.6 17.7±4.9 18.8±5.0
Number of quit attempts
    0-2 23.5% 21.6% 22.4% 26.9%
    3-5 39.6% 37.8% 40.8% 40.3%
    6-10 22.6% 23.0% 22.4% 22.4%
    11-20 11.1% 12.2% 11.8% 9.0%
    20+ 3.2% 5.4% 2.6% 1.5%
Motivation to quit (0-10 scale) 8.5±1.4 8.5±1.4 8.3±1.5 8.6±1.4
FTND 5.4±1.9 5.6±1.7 5.3±2.1 5.1±2.0
CES-D (0-60 scale) 10.6±7.4 11.1±7.7 10.9±7.7 9.6±6.7

Due to missing values, the Ns were 217 for quit attempts, 224 for motivation to quit, 227 for FTND and 223 for CES-D. Otherwise, all other variables had data from 233 to 235 subjects. FTND: Fagerstrom Test for Nicotine Dependence; CES-D: Centers for Epidemiological Studies Depression scale.