Table 3.
Number of cigarettes smoked in the past 30-day montha and all-cause mortality
| N | Death | HR (95% CI)b | |
|---|---|---|---|
| Never smokers | 36,013 | 6,808 | 1.00 |
| Current lifelong non-daily smokers | |||
| ≤ 10 | 248 | 21 | 1.08 (0.62 – 1.90) |
| 11 – 30 | 244 | 27 | 1.34 (0.81 – 2.20) |
| 31 – 60 | 206 | 27 | 2.02 (1.17 – 3.49) |
| > 60 | 263 | 35 | 1.74 (1.12 – 2.72) |
| Current daily smokers | |||
| ≤ 60 (≤ 2 CPD) | 160 | 45 | 1.42 (0.95 – 2.10) |
| 61 – 300 (3 – 10 CPD) | 3,748 | 878 | 2.07 (1.86 – 2.30) |
| 301 – 600 (11 – 20 CPD) | 7,690 | 1,934 | 2.34 (2.16 – 2.54) |
| 601 – 900 (21 – 30 CPD) | 2,043 | 648 | 3.28 (2.86 – 3.76) |
| > 900 (> 30 CPD) | 1,653 | 612 | 3.33 (2.96 – 3.76) |
HR, hazard ratio; CI, confidence interval; CPD; cigarettes per day
a
Based on reported number of days smoked in the past 30 days and number of cigarettes smoked per day on the days they smoked.
b
HR and 95% CI adjusted for sex, race/ethnicity (non-Hispanic white, non-Hispanic black, Hispanic, non-Hispanic other, and missing), education (< high school, high school, some college, college or higher, and missing), and survey year (1991, 1992, and 1995); age as the underlying time metric; baseline hazards were stratified by 5-year birth cohort; never smokers were the referent group.