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Smoking habits of cases and controls
| Cases (n = 257) | Control (n = 514) | |
| Non-smoker (%) | 90 (35) | 355 (69) |
| Current smoker (%) | 69 (27) | 56 (11) |
| Former smoker (%) | 98 (38) | 103 (20) |
| Smoker (%) | 167 (65) | 159 (31) |
| Age of starting smoking | 19 (15-20) | 18 (15-20.5) |
| Cigarettes/d | 21 (15-27) | 22 (10-30) |
| Pack/yr | 28 (16-42) | 25 (10-39) |
Data represent means, with interquartile ranges in parentheses.
