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Table 5 Multivariable conditional logistic regression model 1b 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)   1.09 1.05 1.12 <0.001
Categorical      
Extra rations No 1.00    
  Yes 2.48 1.49 4.12 <0.001
Musculo skeletal exam No 1.00    
  Yes 2.60 1.36 4.99 0.004
Previous colic No 1.00    
  Yes 8.81 2.66 29.2 <0.001
Farm 1 1.00    
  2 0.37 0.21 0.64 <0.001
  1. Model 1b excluded the variables dental disease and weight during the backwards stepwise regression. LRS = likelihood ratio test statistic