. Author manuscript; available in PMC: 2013 Mar 21.

Published in final edited form as: J Appl Gerontol. 2011 Jun 6;32(1):51–75. doi: 10.1177/0733464811409034

Table 4.

Best additive predictive model for SF-36 PCS

Predictive factors	F-statistics (ndf, ddf)	p-value	Proportion of explained variability
Age group	18.61 (3, 350)	<0.0001	84.6%
Gender	3.67 (1, 350)	0.056
Education level	1.41 (3, 350)	0.24
Social support	1.16 (3, 350)	0.326	15.4% (after controlling for demographics)
Hours	2.71 (4, 350)	0.03	15.4% (after controlling for demographics)

R² = 0.226, MSE = 88.395, F-test, F(13, 350) = 7.85, p < 0.0001