Association of Interleukin-1α Functional Polymorphism with Risk of Chronic Periodontitis in Han Chinese Population

Table 1

Demographic and clinical characteristics of the cases and controls.

Variables	Case (n = 884)	Control (n = 893)	value
Age (years) (mean ± SD)	50.24 ± 9.05	50.04 ± 8.74	0.649
Gender (%)
Male	513	495	0.107
Female	371	398
Smoker
Yes	468	465	0.546
No	416	428
No. of lost teeth (mean ± SD)	1.93 ± 1.40	0.47 ± 0.50	<0.0001
BOP (%)	81.17 ± 12.83	12.23 ± 7.11	<0.0001
PPD (mm) (mean ± SD)	6.39 ± 0.79	1.18 ± 0.45	<0.0001
CAL (mm) (mean ± SD)	5.89 ± 0.93	1.24 ± 0.98	<0.0001

SD: standard deviation; BOP: bleeding on probing; PPD, probing pocket depth; CAL: clinical attachment loss.