Table 4.

Final multilevel regression model for diarrhea in 686 ¹ calves raised in group pens on 29 farms in Los Ríos region, Chile.

Factor	Level	Estimate	SE	OR	95% Wald CI for OR	p-Value	Overall p Value
Intercept		−5.04	0.80
Number of calves in the calf barn	≤71	−2.45	0.69	0.85	0.02–0.33	0.0005	0.002
	>71 to ≤129	−1.29	0.70	0.27	0.06–1.09	0.66
	>129 to ≤215	−2.31	0.74	0.09	0.02–0.43	0.002
	>215 (ref)
Frequency of bed cleaning	2–3 times/week	1.59	0.49	4.94	1.85–13.14	0.001	0.0002
	Once/week	2.47	0.61	11.89	3.54–39.97	<0.0001
	Every day (ref)
Calf cleanliness score	Moderately dirty	1.67	0.38	5.31	2.50–11.27	<0.0001	<0.0001
	Dirty	1.17	0.70	3.22	0.80–12–91	0.09
	Clean (ref)
Milk type	Milk replacer	2.14	1.00	8.56	1.18–61.94	0.03	<0.0001
	Waste milk	3.43	0.86	31.02	5.65–170.21	<0.0001
	Treated milk (ref)

¹ Fourteen calves could not be assessed for diarrhea.