Table 4 The number of animals by sex, species and age recruited for the longitudinal study and their respective estimates of animal time at risk (months), number of observed cases and Brucella infection incidence rate

Sex

Male

8

61.60

1

0.016

0.0004–0.091

Female

71

549.40

11

0.020

0.009–0.036

Species

Cattle

31

214.03

6

0.028

0.010–0.061

Camels

30

151.00

8

0.053

0.022–0.104

Goats

32

237.40

3

0.013

0.003–0.036

Sheep

22

161.00

1

0.006

0.0002–0.034

Age

Young

11

74.30

2

0.026

0.003–0.097

Adult

62

536.7

10

0.019

0.009–0.034