Association of vitamin D and knee osteoarthritis in younger individuals

Table 3 The vitamin D status and the disease severity among the knee osteoarthritis patients

Vitamin D status	Disease severity on X-ray				P value
	I	II	III	IV
Sufficient	27	22	17	12	0.07
Insufficient	4	9	11	9
Deficient	4	13	10	8
Parameter		KOOS Score			P value
Severity based on X-ray findings
Early (KL grade I, II)		80.05 (9.30)			< 0.001
Advanced (KL grade III, IV)		50.70 (14.71)
Severity based on vitamin D level
Sufficient		65.31 (18.58)			0.051
Insufficient		60.36 (19.61)
Deficient		65.31 (18.58)

KOOS: Knee Injury and Osteoarthritis Outcome Score; KL: Kellegren-Lawrence stage.