Table 5.

Multiple logistic regression analyses on trypanosome prevalence

Dataset considered	Trypanosome prevalence investigated	Explanatory variables in the selected model	Odd ratio	P-value
On complete dataset	All trypanosomes	‘fly sex’	2.286	0.030
	T. congolense subspp.	‘collection site’	3.025	0.029
	T. congolense Savannah	‘collection site’	0.565	0.625
		‘fly sex’	0.646	0.637
		‘collection site’ × ‘fly sex’	6.419	0.182
	T. congolense Forest	‘collection site’	4.1 × 107	0.993
	T. vivax	‘collection site’	2.7 × 10-7	0.986
		‘fly sex’	2.021	0.330
		‘collection site’ × ‘fly sex’	3.4 × 106	0.986
On Yankari dataset	All trypanosomes	‘fly sex’	2.985	0.079
	T. congolense subspp.	‘fly sex’	2.453	0.237
	T. congolense Savannah	‘fly sex’	4.148	0.172
	T. congolense Forest	‘tsetse species’	5.3 × 107	0.995
		‘fly sex’	2.2 × 107	0.995
		‘tsetse species’ × ‘fly sex’	8.6 × 10-16	0.992
	T. vivax	‘fly sex’	1.9 × 107	0.991

Note: For the complete dataset the complete model considered before model selection was: prevalence ~ ‘collection site’ + ‘fly sex’ + (‘collection site’ × ‘fly sex’). For the Yankari dataset the complete model considered before model selection was: prevalence ~ ‘tsetse species’ + ‘fly sex’ + (‘tsetse species’ × ‘fly sex’). ×: indicates the interaction between two explanatory variables. Trypanosoma congolense subspp. refers to both T. congolense subspecies combined. P-value: P-value associated with each explanatory variable. Significant results are shown in bold