Are There Any Common Genetic Risk Markers for Rheumatoid Arthritis and Periodontal Diseases? A Case-Control Study

Table 5

Genotype and allele distributions of IFNγ SNP rs240561 in relation to severity of PD.

	Probands without RA and severe PD ()	RA and no/mild PD ()	RA and severe PD ()	value
	I	II	III	II vs. III	I vs. II	I vs. III
AA (%)	28.3	26.3	48
AT (%)	44.4	50	40
TT (%)	27.3	23.7	12	0.151	0.756	0.110
A (%)	50.5	51.3	68
T (%)	49.5	48.7	32	0.039	0.966	0.039

Statistical comparisons were made by the chi-square test including Yates correction. PD: periodontal disease.