Table 3.

Univariate and multivariate associations with time to event

	Cessation of heart beat				Cessation of purposeful movement
	Univariate		Multivariate		Univariate		Multivariate
Variable	β weight	P	β weight	P	β weight	P	β weight	P
Weight (g)a	0.0835 ± 0.0846	0.3233	0.0801 ± 0.0751	0.2860	−0.5565 ± 0.3792	0.1422	0.0206 ± 0.1437	0.8858
Baseline heart ratea	−0.0066 ± 0.0056	0.9848	−0.0018 ± 0.0037	0.6300	−0.0178 ± 1.7670	0.0852	−0.0055 ± 0.0063	0.3840
Female compared with male	−0.0271 ± 0.1306	0.8354	0.0557 ± 0.0806	0.4897	0.4613 ± 0.5352	0.3888	−0.0212 ± 0.0063	0.9287
Xylazine compared with  pentobarbitalb	−0.8127 ± 0.1765	<0.0001	−0.8222 ± 0.1799	<0.0001	3.5340 ± 0.3796	<0.0001	3.5013 ± 0.3865	<0.0001
MS222 compared with  pentobarbitalb	−0.3870 ± 0.2248	0.0851	−0.4307 ± 0.1997	0.0311	0.1200 ± 0.3796	0.7519	0.0960 ± 0.3833	0.8023

^aβ weight (mean ± SE) expresses the change in the time (min) to event per unit increase in the independent variable.

^bβ weight (mean ± SE) expresses the difference in mean scores as per comparison.