Table 4. Characteristics of knee osteoarthritis patients in high-total knee arthroplasty and low- total knee arthroplasty use hospitals (n = 1541).

	Low-use n = 898(%)	High-use n = 643(%)	p value
Age, years	69±10	70±8	0.588
Male gender	243(27.1)	154(24.0)	0.169
Charlson Comorbidity Index Score≧1	469(52.2)	323(50.2)	0.440
High socioeconomic status (NT≧ $ 25001 or US $ 833)	54(6.0)	25(3.9)	0.062
Urbanization level: Rural	441(49.1)	318(49.5)	0.893
Ownership: Public	154(17.1)	408(63.5)	<0.001
Total knee arthroplasty	445(49.6)	593(92.2)	<0.001

Parenthesis is percentage of patients in high-use or low-use hospitals