Table 4. Risk factors for human brucellosis in livestock professionals. Namibe, Angola, 2012.

Variable	Crude OR	95%CI	p
Category
Worker*
Breeder	3.54	1.57–8.30	0.004
Gender
Male*
Female	0.86	0.39–1.86	0.703
Age group (years)
> 60*
10–19	0.64	0.21–1.97	0.433
20–29	0.27	0.07–1.03	0.055
30–39	0.68	0.19–2.33	0.541
40–49	0.49	0.13–1.89	0.297
50–59	0.57	0.09–3.38	0.537
Education level
Basic education*
No education	2.25	1.06–4.79	0.036

* Reference class.