Table 4. Variables related to time to death in the Cox proportional hazards model of survival of radio collared pumas in southern California, USA.

Covariate a	Hazard Ratio	SE	Z	P>|z|	95% CI
Age at Entry b
<18 months	0.53	0.28	-1.21	0.23	0.19–1.48
18–30 months	1.56	0.75	0.93	0.35	0.61–3.99
Year at Exit c
2001*	149.20	209.78	3.56	0.00	9.48–2347.27
2002	5.16	6.85	1.24	0.22	0.38–69.63
2003*	9.86	8.34	2.71	0.01	1.88–51.73
2004	5.41	6.98	1.31	0.19	0.43–67.91
2005*	12.75	11.51	2.82	0.01	2.18–74.76
2006*	7.10	6.82	2.04	0.04	1.08–46.64
2009*	8.02	7.79	2.14	0.03	1.20–53.77
2010	1.70	1.71	0.53	0.60	0.24–12.16
2011	3.03	4.03	0.84	0.40	0.23–40.89
2012	6.16	6.14	1.82	0.07	0.87–43.44
2013	3.55	3.48	1.29	0.20	0.52–24.23

*Covariates significant at P ≤ 0.05.

^aThe final model controlled for population and sex which were not significantly associated with time to mortality

^bOldest age class (>30 months old) designated as reference category.

^cYears 2007 and 2008 designated as reference category