Arthroplasty Utilization in the United States is Predicted by Age-Specific Population Groups

Table 2

Pearson product-moment correlations.

	Hip	Knee
Population total	0.9660183 (95% CI 0.9060745, 0.9879475)	0.9318893 (95% CI 0.8173353, 0.9755691)
Population > 64 years	0.9844568* (95% CI 0.9563160, 0.9945204)	0.9715806* (95% CI 0.9210546, 0.9899387)
Population > 84 years	0.9723646 (95% CI 0.9231783, 0.9902188)	0.9489339 (95% CI 0.8609842, 0.9817860)

∗The strongest correlation and the narrowest 95% confidence intervals (CI).