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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.

From: Epidemiology of impaction colic in donkeys in the UK

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