Table 8.

Results of multivariable modeling of factors associated with mortality in heifer calves (n = 2,272)

Model results					Example model outcomes
Final model variable	Variable level	β-Estimate (SE)	Odds ratio (SE)	Factor P-value	Example variable level	Predicted mortality risk (SE)
Birth weight (kg)		−0.0553 (0.021)	0.946 (0.0198)	0.011	35.0	0.047 (0.202)
					45.0	0.023 (0.1714)
Serum IgG (g/L)		−0.037 (0.013)	0.963 (0.013)	0.004	8.0	0.052 (0.248)
					30.0	0.020 (0.190)
Liquid diet fat per day (kg)	≤0.15	Referent	Referent	0.011	≤0.15	0.099 (0.064)
	0.16–0.21	0.049 (0.341)	1.05 (0.341)		0.16–0.21	0.037 (0.223)
	≥0.22	1.103 (0.340)	3.01 (0.340)		≥0.22	0.035 (0.023)
Morbidity	Any	1.519 (0.259)	4.567 (0.219)	<0.001	Any	0.079 (0.058)
	None	Referent	Referent		None	0.018 (0.012)