Table 1.
Body mass index and pack-years of smoking according to baseline characteristics (age-standardizeda) among 56,835 women in the Black Women’s Health Study, 1995–2011
| Body mass index | Pack-years of smoking | |||||
|---|---|---|---|---|---|---|
|
| ||||||
| 18.5–24.9 (N=20,843) | 25–29 (N=17,953) | ≥30 (N=17,162) | Never smoker (N=36,621) | <20 (N=15,186) | ≥20 (N=4,024) | |
| Age in 1995, mean | 36.5 | 40.8 | 40.9 | 37.0 | 41.4 | 48.5 |
| Education, 16+ yrs, % | 51 | 43 | 38 | 49 | 36 | 33 |
| Vigorous exercise, 5+ hr/wk, % | 17 | 14 | 8 | 13 | 13 | 13 |
| Alcoholic drinks, 7+/wk, % | 6 | 6 | 6 | 3 | 11 | 11 |
| Family history of lung cancer, % | 7 | 8 | 8 | 7 | 8 | 11 |
| Geographic region | ||||||
| Northeast, % | 27 | 27 | 27 | 25 | 32 | 36 |
| South, % | 30 | 31 | 31 | 33 | 26 | 26 |
| Midwest, % | 22 | 24 | 25 | 23 | 24 | 22 |
| West, % | 21 | 18 | 17 | 19 | 18 | 16 |
| Body mass index, 30+, % | 28 | 30 | 30 | |||
| Pack-years of smoking, 20+, % | 7 | 7 | 7 | |||
| Smoked 15+ cigarettes/day, % | 11 | 12 | 13 | 0 | 18 | 99 |
| Started smoking at age <18, % | 13 | 15 | 15 | 0 | 39 | 63 |
| Current smokers, % | 17 | 18 | 16 | 0 | 47 | 65 |
| Former smokers, % | 17 | 20 | 22 | 0 | 53 | 35 |
a
Values are standardized to the age distribution of the study population