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Table 4 Proportional hazard model for mortality in 3519 white veal calves, housed in 10 commercial veal herds in Belgium with the studied diseases added as time-varying covariates

From: Impact of respiratory disease, diarrhea, otitis and arthritis on mortality and carcass traits in white veal calves

Variable

Level

Calves (n)

ß

SD

HR

HR (95% CI)

P-value

Calf gender

Male (ref)

3202

0

-

   

Female

317

−0.8

0.4

0.5

0.2-0.9

0.04

Breed

      

0.05

 

Black HF (ref.)

1296

0

-

   

Red HF

124

0.8

0.3

2.1

1.1-4.2

0.03

Crossbreds

884

−0.2

0.3

0.8

0.5-1.4

0.50

BB

1215

−0.3

0.3

0.8

0.4-1.4

0.38

BRD

No (ref.)

2997

0

-

   

Yes

522

1.7

0.3

5.5

3.0-10.2

<0.001

Diarrhea

No (ref.)

3333

0

-

   

Yes

186

2.4

0.4

11.0

5.4-22.6

<0.001

Arthritis

No (ref.)

3467

0

-

   

Yes

52

1.7

0.9

3.9

1.6-5.3

0.05

Otitis

No (ref.)

3463

0

-

   

Yes

56

1.9

0.9

7.0

1.3-38.5

0.03

Herd effect a

  

0.3

0.2

  

<0.001

  1. SD = standard deviation; HR = hazard ratio; BRD = bovine respiratory disease; HF = Holstein Friesian; BB = Belgian Blue; ref. = referent category; afrailty term.