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Table 5 Multivariable logistic regression analysis of the association of cow-level mastitis with different risk factors

From: Bovine mastitis: prevalence, risk factors and isolation of Staphylococcus aureus in dairy herds at Hawassa milk shed, South Ethiopia

Variable

Category

OR

SE

z

p

95% CI for OR

Herd size

Ā 

ā‰¤10 cows

Ref

Ā Ā Ā Ā 
Ā 

>10 cows

3.1

1.0

3.74

<0.001

1.7 ā€“ 5.7

Breed

Ā 

Local

Ref

Ā Ā Ā Ā 
Ā 

Cross

16.4

8.3

5.55

<0.001

6.1 ā€“ 44.1

Milking mastitic cow last

Ā 

Yes

Ref

Ā Ā Ā Ā 
Ā 

No

2.0

0.6

2.53

0.011

1.2 ā€“ 3.5

Bedding material

Ā 

Yes

Ref

Ā Ā Ā Ā 
Ā 

No

2.8

0.9

3.24

0.001

1.5 ā€“ 5.3

Parity

Ā 

1

Ref

Ā Ā Ā Ā 
Ā 

2

1.2

0.5

0.48

0.629

0.5 ā€“ 2.9

Ā 

3

3.2

1.5

2.46

0.014

1.3 ā€“ 8.1

Ā 

ā‰„4

24.8

12.2

6.50

<0.001

9.4 ā€“ 65.2

Stage of lactation

Ā 

Early (1 ā€“ 2 months)

Ref

Ā Ā Ā Ā 
Ā 

Mid (3 ā€“ 6 months)

0.3

0.1

āˆ’4.17

<0.001

0.1 ā€“ 0.5

Ā 

Late (ā‰„7 months)

0.7

0.2

āˆ’0.99

0.323

0.4 ā€“ 1.4

Udder & leg hygiene

Ā 

Slightly dirty

Ref

Ā Ā Ā Ā 
Ā 

Moderately dirty

2.6

0.8

3.27

0.001

1.5 ā€“ 4.7

Ā 

Very dirty

8.7

4.0

4.73

<0.001

3.5 ā€“ 21.3

Teat end shape

Ā 

Pointed

Ref

Ā Ā Ā Ā 
Ā 

Round

3.2

1.0

3.72

<0.001

1.7 ā€“ 5.9

Ā 

Flat

7.6

2.8

5.57

<0.001

3.7 ā€“ 15.7

Constant

Ā Ā Ā 

āˆ’7.44

<0.001

Ā