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Table 3 Multivariable linear regression model of the effect of infection with different Trypanosoma species and other significant confounding factors on the packed cell volume (PCV) of 241 horses and donkeys from the Central River Division, The Gambia 2006.

From: Trypanosomosis in The Gambia: prevalence in working horses and donkeys detected by whole genome amplification and PCR, and evidence for interactions between trypanosome species

Variable Coefficient ± S.E P-value
Intercept 36.1 1.2  
T. congolense    
  -ve Ref   
  +ve -11.9 0.8 <0.001
T. Brucei sp    
  -ve    
  +ve -2.0 0.9 0.03
T. vivax    
  -ve Ref   
  +ve -3.3 1.2 0.007
Gender    
  Male Ref   
  Female -1.6 0.7 0.03
Species    
  Horse Ref   
  Donkey -1.9 0.8 0.02
Trypanosoma status on microscopic examination    
  -ve Ref   
  +ve -5.3 1.0 <0.001
T. congolense* T. vivax interaction term    
   Ref   
  +ve 6.4 2.3 0.006
  1. Ref – Reference category