Skip to main content

Table 3 Final logistic regression model for an outbreak of interdigital phlegmon (IP)

From: Survey of interdigital phlegmon outbreaks and their risk factors in free stall dairy herds in Finland

Variable

n

Odds ratio

P value

95% CI1

Wald2

Free stall type

 Insulated

221

Referent

  

0.09

 Partly insulated

60

0.31

0.06

0.09–1.05

 

 Non-insulated

13

0.14

0.07

0.02–1.20

 

Ventilation

 Natural

84

Referent

   

 Mechanical3

210

0.18

<0.01

0.06–0.54

 

Herd size

 50–65

125

Referent

  

0.07

 66–99

115

0.97

0.94

0.41–2.26

 

 ≥100

54

2.60

0.04

1.03–6.58

 

Enlargement4 within 3 years

 No

184

Referent

   

 Yes

110

3.32

<0.01

1.58–6.98

 

Open or closed herd

 Closed herd

194

Referent

   

 Open herd

100

4.91

<0.01

2.32–10.37

 

Fields in organic farming

 No

270

Referent

   

 Yes

24

3.75

0.02

1.21–11.66

 

Milk yield5

294

0.73

0.18

0.45–1.16

 

Region

 Southern

38

Referent

  

0.56

 Western

138

1.75

0.40

0.48–6.37

 

 Eastern

62

2.10

0.30

0.51–8.65

 

 Northern

56

2.77

0.17

0.65–11.82

 

_Constant

 

1.88

0.80

0.02–218.92

 
  1. The associations of various herd level variables and an outbreak of IP. The number of the outbreak herds in the model is 55 and control herds 239 (n = 294)
  2. 195% CI = 95% confidence interval
  3. 2Wald-test was used to test the overall P value of the variable
  4. 3Natural with additional precision ventilation of the manure drain or mechanical with or without additional precision ventilation of the manure drain
  5. 4Enlargement or renovation of the barn
  6. 5Milk yield is in 1000 kg