Table 1.

Model selection table for a proportional hazards model explaining survival of female eiders.

Variable	b	exp(b)	se(b)	z	p
Relative head volume	0.14	1.15	0.16	0.87	0.39
Radius-ulna length	−0.19	0.83	0.18	−1.04	0.30
Annual predation risk	0.13	1.14	0.16	0.78	0.44
Relative head volume:annual predation risk	−0.32	0.73	0.16	−2.06	< 0.04
Condition index	−0.13	0.88	0.19	−0.69	0.49
Relative head volume:condition index	0.30	1.35	0.26	1.17	0.24
Year of death	0.43	1.54	0.50	0.86	0.39
Condition index:annual predation risk	0.20	1.22	0.20	0.98	0.33

Covariates in bold font constitute the final model.