Table 1 Univariate 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

0.27

Age

<2 years

1.30 (3/231)

1.00*

-

-

2–4 years

3.6 (11/304)

11.10

1.449; 85.062

0.02

Over 4 years

2.3 (13/568)

4.96

0.642; 38.398

0.67

Location

Serengeti

2.64 (15/569)

1.00*

-

-

Ngorongoro

2.94 (11/374)

1.12

0.508; 2.464

0.78

Bunda

0.63 (1/160)

0.23

0.030; 1.772

0.16

Animal tested

1–20

3.5 (6/170)

1.00*

-

-

21–40

1.9 (5/265)

0.76

0.229; 2.545

0.66

≥ 41

2.4 (16/668)

0.81

0.292; 2.243

0.69

Household size

1–5

1.30 (2/154)

1.00*

-

-

6–10

2.4 (6/248)

1.12

0.369;3.413

0.84

> = 11

2.7 (19/701)

0.56

0.198;1.603

0.28