Association between Polymorphisms in Interleukins 4 and 13 Genes and Chronic Periodontitis in a Han Chinese Population

Table 1

Demographic and clinical characteristics of the study population.

	Healthy controls	CP patients
Age (years; mean ± SD)	50.40 ± 4.60	47.80 ± 5.20
Male ()	195	270
Female ()	129	170
Total	324	440
PI (score; mean ± SD)	1.79 ± 0.26	2.21 ± 0.15
GI (score; mean ± SD)	1.84 ± 0.12	2.35 ± 0.24
PD (mm; mean ± SD)	2.10 ± 0.24	5.90 ± 0.47
CA loss (mm; mean ± SD)	NA	5.20 ± 0.78

Values represent mean ± SD.
NA = not applicable.