Table 4

Multivariable conditional logistic regression model 1a of risk factors for impaction colic in donkeys housed at the Donkey Sanctuary between 1st January 2003 and 31st March 2005.

Variable

Odds Ratio

Lower 95% CI

Upper 95% CI

LRS P-value


Continuous


Age (years)

1.06

1.02

1.11

0.008

Weight (kg)

0.98

0.96

0.99

<0.001


Categorical


Extra rations

No

1.00

Yes

2.21

1.07

4.53

0.03

Musculo skeletal exam

No

1.00

Yes

2.20

0.95

5.13

0.07

Previous colic

No

1.00

Yes

6.80

1.65

27.95

0.008

Farm

1

1.00

2

0.43

0.19

0.97

0.04


Model 1a excluded the variable dental disease during the backwards stepwise regression. LRS = likelihood ratio test statistic

Cox et al. BMC Veterinary Research 2007 3:1   doi:10.1186/1746-6148-3-1

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