Table 6.

Multivariable mixed-effect Cox proportional hazard regression analysis of explanatory variables associated with the incidence of morbidity in calves under six months of age in Jimma town

Variables	Levels	HR (95%CI)	P-value
Dam parity	Multiparous	1	< 0.001
	Primiparous	3.24 (1.65–6.36)
Pen cleaning	Infrequently	1	< 0.001
	Regularly	0.17 (0.08–0.38)

^{HR*= Hazard ratio, CI= confidence interval, hr.= hour, NA= not applicable}