Table 1.

Participant characteristics (11,064 NSABP BCPT participants randomly assigned on or before May 31, 1994)

Participant characteristicNPercent
Current smoker
 No9,60986.8
 Yes1,41712.8
 Unknown380.3
Baseline BMI ≥ 256,63560.0
Leisure-time physical activity
 Moderate heavy5,05745.7
 Inactive light5,96853.9
 Unknown390.4
Alcohol use
 None2,26820.5
 1 drink/day7,28465.8
 1+ drink/day1,47113.3
 Unknown410.4
Age ≥ 603,30829.9
Race
 White10,57295.6
 Black1831.7
 Hispanic1121.0
 Other/unknown1971.8
Education
 Grade school/some high school/high school2,61723.7
 Associate degree/some college/vocational training4,29138.8
 College degree/some postcollege2,46622.3
 Graduate degree1,65114.9
 Unknown390.4
Treatment assignment
 Placebo5,53750.0
 Tamoxifen5,52750.0
Breast cancer risk
 ≤2%2,70924.5
 2%–5%6,60859.7
 >5%1,74715.8
Comorbid conditions8,70178.6
Life-threatening illness2562.3
Living alone1,71715.5
Employment status
 Disabled/homemaker/medical leave/retired/unemployed3,80834.4
 Full-time/part-time/student7,21665.2
 Unknown400.4
Occupation
 Operator/fabricator/laborer/other8427.6
 Homemaker/managerial/service/technical, sales, administrative support10,18292.0
 Unknown400.4