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df - degrees of freedom
| Age | Current smoker n (%) | Ever smoker n (%) | Nonsmoker n (%) | Test statistics (df) p-value |
| 18 - 20 years | 48 (37.8) | 12 (31.6) | 344 (53.6) | 19.6 (6), 0.003 (Pearson's Chi-square test) |
| 21 - 23 years | 26 (20.5) | 9 (23.7) | 115 (17.9) | |
| 24 - 26 years | 30 (23.6) | 9 (23.7) | 119 (18.5) | |
| 27 - 30 years | 23 (18.1) | 8 (21) | 64 (10) | |
| Total | 127 (100) | 38 (100) | 642 (100) |
