Table 2 Multivariate analysis of risk factors for cattle tuberculin reactors using General Linear models (GLM) with herd as random effect

Sex

Female

2.07 (15/724)

1.00*

-

-

Male

3.17 (12/379)

1.53

0.714; 3.29

0.274

Age

<2 years

1.30 (3/231)

1.00*

-

-

2–4 years

3.6 (11/304)

11.06

1.444; 84.785

0.005

Over 4 years

2.3 (13/568)

5.71

0.717; 45.436

Location

Serengeti

2.64 (15/569)

1.00*

-

-

Ngorongoro

2.94 (11/374)

0.93

0.417; 2.077

0.007

Bunda

0.63 (1/160)

0.21

0.028; 1.634

Animal tested

1–20

3.5 (6/170)

1.00*

-

-

21–40

1.9 (5/265)

0.55

0.151; 2.006

≥ 41

2.4 (16/668)

0.88

0.308; 2.534

0.015

Household size

1–5

1.30 (2/154)

1.00*

-

-

6–10

2.4 (6/248)

1.97

0.599; 6.478

> =11

2.7 (19/701)

0.74

0.255; 2.163

0.007