. Author manuscript; available in PMC: 2008 May 29.

Published in final edited form as: Exp Gerontol. 2007 Jun 29;42(10):1020–1032. doi: 10.1016/j.exger.2007.06.002

Table 4.

Cox regression analysis results for Experiment 2

Dependent variable	Predictor	Hazard ratio	Wald statistics
Lifespan	AFF	0.912 (0.885–0.940)	35.7, df = 1, p < 0.001
	Limited foraging	0.514 (0.357–0.739)	12.9, df = 1, p < 0.001
	Pollen foraging	0.524 (0.353–0.778)	10.3, df = 1, p = 0.001
AFF	Limited foraging	0.615 (0.440–0.859)	8.1, df = 1, p = 0.004
Flightspan	AFF	1.030 (1.001–1.061)	4.1, df = 1, p = 0.043
	Limited foraging	0.523 (0.364–0.751)	12.0, df = 1, p < 0.001
	Pollen foraging	0.562 (0.380–0.831)	8.3, df = 1, p = 0.004