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Cotinine categories in relation to gingival bleeding, pocket depth, and attachment level.
| < 15 ng/mL | < 15 ng/mL | |
|---|---|---|
| Gingival bleeding | ||
| Subjects with BOP | 46.5% (302) | 53.6% (348) |
| Subjects without BOP | 49.2% (148) | 50.8% (153) |
| Pocket depth | ||
| < 3 mm | 46.8% (193) | 53.2% (257) |
| ≥ 4 mm | 47.7% (219) | 52.3% (282) |
| Attachment level | ||
| < 3 mm | 47.1%(267) | 47.8% (300) |
| ≥ 4 mm | 52.9% (182) | 52.2% (199) |
