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.
| 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 | |