Table 3 Rate ratios (RR) and 95% confidence intervals (CI) of mortality in 1131 amyotrophic lateral sclerosis cases according to smoking status, General Practice Research Database, 1990-2008
Smoking status | N. deaths | Person-years | RR (95% CI) * |
|---|---|---|---|
Entire sample | |||
Never | 266 | 722.7 | 1.00 (ref.) |
Ever | 394 | 1103.3 | 1.06 (0.90-1.23) |
Former | 191 | 496.4 | 1.11 (0.92-1.34) |
Current | 203 | 606.9 | 1.01 (0.84-1.21) |
Non-heavy smokers | 352 | 1029.7 | 1.02 (0.87-1.20) |
Heavy smokers | 42 | 73.6 | 1.45 (1.03-2.03) |
Missing | 142 | 530.8 | 0.92 (0.74-1.14) |
Men | |||
Never | 141 | 400.9 | 1.00 (ref.) |
Ever | 213 | 733.4 | 0.90 (0.72-1.11) |
Former | 106 | 347.4 | 0.91 (0.71-1.17) |
Current | 107 | 386.0 | 0.88 (0.69-1.14) |
Non-heavy smokers | 195 | 695.8 | 0.88 (0.71-1.10) |
Heavy smokers | 18 | 37.6 | 1.08 (0.65-1.79) |
Missing | 76 | 282.8 | 0.91 (0.68-1.22) |
Women | |||
Never | 125 | 321.9 | 1.00 (ref.) |
Ever | 181 | 369.9 | 1.31 (1.04-1.65) |
Former | 85 | 149.0 | 1.46 (1.11-1.94) |
Current | 96 | 220.9 | 1.20 (0.92-1.57) |
Non-heavy smokers | 157 | 333.9 | 1.26 (0.99-1.59) |
Heavy smokers | 24 | 36.0 | 1.94 (1.24-3.06) |
Missing | 66 | 248.0 | 0.92 (0.67-1.26) |