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| Stopped smoking | Age of initiation group | Total | ||||
| 11-13 years | 14-16 years | 17-19 years | 20-22 years | 23-25 years | ||
| Yes | 0 (0%) | 3 (14.28%) | 11 (52.38%) | 7 (33.33%) | 0 (0%) | 21 (100%) |
| No | 2 (2.06%) | 17 (17.52%) | 41 (42.26%) | 34 (35.50%) | 3 (3.09%) | 97 (100%) |
| Lost to follow-up | 3 (33.33%) | 3 (33.33%) | 0 (0%) | 0 (0%) | 3 (33.33%) | 9 (100%) |
| p-value | <0.001 (Fisher’s exact test) | |||||
