Table 4.

Comparison of METS-IR in Patients with KOA with That of Participants in the CHARLS 2011 National Survey

Category			KOA	The CHARLS 2011	P value
Total
		n	108	4686
		Age (years)	64.65 ± 8.32	59.43 ± 9.82	<0.001
		METS-IR	40.29 ± 6.98	36.20 ± 8.50	<0.001
	nMetS
		n	51	2462
		Age (years)	65.25 ± 8.92	58.32 ± 9.89	<0.001
		METS-IR	35.49 ± 4.87	31.76 ± 6.27	<0.001
	MetS
		n	57	2224
		Age (years)	64.11 ± 7.79	60.67 ± 9.59	<0.001
		METS-IR	44.58 ± 5.68	41.12 ± 7.92	<0.001
Age (45–64 years)
	nMetS
		n	22	1405
		METS-IR	36.94 ± 5.50	30.18 ± 3.85	<0.001
	MetS
		n	31	790
		METS-IR	45.03 ± 6.48	40.22 ± 8.82	<0.001
Age (65–84 years)
	nMetS
		n	28	492
		METS-IR	34.30 ± 4.01	28.29 ± 3.95	<0.001
	MetS
		n	26	453
		METS-IR	44.03 ± 4.61	36.87 ± 8.08	<0.001

Note: One nMetS patient was less than 45 years old and was excluded from the calculations by age group.

Abbreviations: KOA, knee osteoarthritis; METS-IR, metabolic score for insulin resistance.