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Relationship between smoking and periodontitis [n (%)]
| Smoking status | Control | Moderate periodontitis | Severe periodontitis | x2 | P |
|---|---|---|---|---|---|
| Current smoker (n=143) | 22 (8.46) | 27 (10.63) | 94 (22.49) | 32.280 | <0.001 |
| Ever smoker (n=362) | 102 (39.23) | 102 (40.16) | 158 (37.80) | ||
| Non-smoker (n=427) | 136 (52.31) | 125 (49.21) | 166 (39.71) |
