Research Article
The Influence of Cigarette Smoking on Gingival Bleeding and Serum Concentrations of Haptoglobin and Alpha 1-Antitrypsin
Table 4
Correlation between plaque index and smoking variables.
| | Mean ± SD | Patient number | Pearson correlation | value | S/NS |
| Number of cigarettes per day | | 99 | 0.017 | 0.870 | NS | Duration of smoking in years | | 99 | 0.366 | 0.001 | S | Cotinine (ng/dL) | | 99 | 0.263 | 0.008 | S | Haptoglobin (mg/dL) | | 99 | 0.137 | 0.178 | NS | Alpha 1-antitrypsin (mg/dL) | | 99 | 0.196 | 0.052 | NS |
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