Table 4.

Genotype distribution of OA subgroups stratified by K/L score

		Genotype
K/L score	Total	CC(%)	CT(%)	TT(%)	P value*
2	75	50(66.7)	21(28.0)	4(5.3)	0.86
3	54	37(68.5)	15(27.8)	2(3.7)
4	54	32(59.3)	19(35.2)	3(5.5)

* The P value was calculated using 3 × 3 χ² test.