Table 2.

Factors significantly related to time to death in the final Cox proportional hazards model of survival of bighorn sheep translocated to the San Andres Mountain, New Mexico, USA.

Factor	Hazard Ratio	Std. Err.	Z	P>|z|	95% Conf. Interval
Age 3 to <6 yr a	1.47	0.664	0.85	0.397	0.60 - 3.56
Age ≥6 yr a	3.37	1.75	2.34	0.019	1.22 - 9.32
BRSV antibodies b	0.37	0.18	-2.03	0.043	0.14 - 0.97

^a Youngest age class (1 to <3 years old) designated as reference category

^b BRSV = bovine respiratory syncitial virus