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	𝑃 value	S/NS
Number of cigarettes per day	13.39±5.75	99	0.017	0.870	NS
Duration of smoking in years	16.03±8.78	99	0.366	0.001	S
Cotinine (ng/dL)	106.9±30.71	99	0.263	0.008	S
Haptoglobin (mg/dL)	76.04±52.48	99	0.137	0.178	NS
Alpha 1-antitrypsin (mg/dL)	141.90±18.40	99	0.196	0.052	NS