Table 4.

Correlation Coefficients of the Original Preventive Services Index or Principal Component Analysis Score, With Other Participant Characteristics, by Sex, Silver Sneakers and EnhanceFitness Programs, 1997-2004

Component	Original Index (n = 38,046)	Original: Men Only (n = 14,443)	Original: Women Only (n = 23,603)	PCA: Men Only (n = 14,443)	PCA: Women Only (n = 23,603)
RxRiska	−0.083	−0.086	−0.084	−0.099	−0.103
ED baseline costs	−0.082	−0.064	−0.093	−0.068	−0.091
Total baseline costs	−0.068	−0.059	−0.066	−0.065	−0.072
Household incomeb	0.074	0.081	0.079	0.082	0.075
Enrolled in SS or EF	0.187	0.160	0.209	0.154	0.187
SS or EF visitsc	0.027	0.015	0.064	0.017	0.055
SS or EF months	0.066	0.066	0.073	0.068	0.071

Abbreviations: PCA, principal component analysis; ED, emergency department; SS, Silver Sneakers; EF, EnhanceFitness.

^a RxRisk is expressed as predicted 6-month costs and is a measure of comorbidity based on age, sex, and pharmacy use, for the 6 months before enrollment in either fitness program.

^b Census tract median household income.

^c Total number of SS or EF visits attended (or months of follow-up) during the first year after enrollment for seniors who were either SS or EF enrollees (n = 10,090).