Table 5.

Outputs of a final multivariable model fitted to the longitudinal data illustrating adjusted hazard rate ratios of Brucella spp. exposure in recruited animals

Variable	Levels	Hazard Rate Ratio		P - value
		Estimate	95% Confidence interval
Sex	Male	0.55	0.06–4.55	0.58
	Female	1.00	–
Species	Cattle	4.38	1.00–19.11	0.05
	Camels	5.66	1.62–19.78	0.01
	Sheep	0.78	0.09–6.54	0.82
	Goats	1.00	–
Age	Young	2.41	0.35–16.80	0.37
	Adult	1.00	–

Number of observations 79, number of events 12

The estimated frailty variance for the random effect term (household ID) using maximum likelihood was 0.54 (SE = 0.08)