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Distribution of the IL-6 (−174) alleles in the study groups.*
| Healthy controls | Severe periodontitis | Moderate periodontitis | |
|---|---|---|---|
| Non-smokers | |||
| G (%) | 77 (74) | 77 (81·9) | 90 (76·3) |
| C (%) | 27 (26) | 17 (18·1) | 28 (23·7) |
| Non-smokers + smokers | |||
| G (%) | 78 (72·2) | 104 (77·6) | 140 (79·5) |
| C (%) | 30 (27·8) | 30 (22·4) | 36 (20·5) |
No statistical difference was observed (2 × 2 contingency table).
