Table 1.

Characteristics of smoking variables and other risk factors by never, former, and current smoking among controls (Prostate, Lung, Colorectal, and Ovarian Trial, 1993-2000)

Never smokers (N = 15,498)Current smokers (N = 2,394)Former smokers (N = 14,157)
Age62.9 (5.3)61.3 (4.7)62.7 (5.2)
Sex (% men)36.756.961.7
Education (%)
    <12 y5.010.76.8
    12 y/high school equivalent36.739.135.1
    Some college19.324.022.3
    College and above39.026.235.8
Race (% White)90.587.790.6
Marital status (% married/as married)80.167.280.6
Ever use aspirin or ibuprofen (%)55.763.363.7
Physical activity >3 h/wk (%)41.726.341.7
Body mass index (kg/m2)27.0 (4.9)26.2 (4.5)27.6 (4.7)
Alcohol intake (g/d)5.6 (13.4)16.8 (35.0)13.9 (25.7)
Fruit intake (g/d)3.7 (2.3)2.5 (2.0)3.3 (2.2)
Red meat (g/d)66.8 (56.4)98.8 (73.7)81.4 (67.6)
Smoking rates (%)7.544.2
    Age started smoking19.2 (6.5)18.5 (4.5)
    Years since started smoking42.1 (7.8)44.3 (6.6)
    Cigarettes smoked per day18.4 (10.9)18.2 (12.2)
    Smoking duration (y)41.6 (7.8)22.2 (12.1)
    Pack-years39.1 (24.9)22.0 (20.8)
  • NOTE: Unless otherwise specified, means (SD) are presented.