Table 3. Univariable Cox proportional hazards model for risk factors associated with duration of the disease signs for diarrhea.

Univariable models	IRR	95% CI	p-value
Intake year 2011 (n = 95)	1.83	1.27–2.64	0.001
Number of drugs (n = 102)
1 to 4 (n = 54)	1.00
5 to 8 (n = 32)	1.16	0.74–1.80	0.517
9 or more (n = 16)	0.57	0.32–0.99	0.049
Metronidazole (n = 118)	0.29	0.087–0.96	0.043
Enrofloxacin (n = 113)	0.55	0.30–1.00	0.051
Scopolamine butylbromide (n = 113)	0.38	0.18–0.80	0.011
Berberine (n = 113)	0.44	0.20–0.95	0.037