Interleukin-1 Two-Locus Haplotype Is Strongly Associated with Severe Chronic Periodontitis among Yemenis

Table 1

Clinical characteristics of the study groups.

Variable	Cases 𝑛=40	Controls 𝑛=40
No. of males (%)	21 (52.5%)	20 (50.0%)
Mean age ±SD	43.40±7.06	42.95±5.27
Mean clinical attachment loss ±SD^*	05.53±1.15	00.41±0.94
Mean pocket depth ±SD^*	03.06±0.60	01.12±0.32
Mean plaque index ±SD^*	01.60±0.49	00.97±0.41

^* Difference statistically significant; t-test.