Table 2.

Per-capita numbers and use of TKA in Ontario and Pennsylvania

	TKA use rates a
	Ontario	Pennsylvania	p value
Total	23	30	< 0.001
Income quintile
Lowest	18	31	< 0.001
2nd to 4th	24	26	< 0.001
Highest	23	38	< 0.001
Age
< 50 years	0.9	2	< 0.001
50-65 years	29	42	< 0.001
≥ 65 years	67	79	< 0.001
Gender
Men	18	23	< 0.001
Women	27	36	< 0.001

^aValues are the total use rate, or TKA per 10,000 population per year; the Ontario and Pennsylvania populations were older than 18 years of age and were directly standardized to match the age and gender.