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| Genotype | Daily Smoker | Habitual Smoker | Non-Habitual Smoker |
| Mean age at onset (N) | Mean age at onset (N) | Mean age censored (N) | |
| AA | 16.41±2.6 (611)* | 15.67±3.09 (147) | 21.54±3.45 (465) |
| AG | 16.07±2.6 (518) | 15.82±2.92 (173) | 21.15±3.40 (330) |
| GG | 15.56±2.4 (162)* | 15.55±2.59 (64) | 21.42±3.48 (94) |
Indicates t test (two tailed) p = 0.0002.
