Table 3. Incidence and prevalence of different bovine trypanosomes during 18 months follow-up period in RAP and non RAP regimens.

a) Incidence
Descriptive statistics
	Sampled (n)	Follow-up years	Positive (n)	Incidence per 100 years
No RAP	1205	1246	320	25.7
RAP	2250	2164	211	9.8
Inferential statistics
Model	variable	IRR	95% CI	P
unadjusted	RAP	0.37	0.22–0.65	<0.001
adjusted	RAP	0.36	0.21–0.62	<0.001
	age 1–3 vs >3 yrs	1.16	0.97–1.4	0.11
	age <1 vs >3 yrs	0.97	0.73–1.28	0.82
	sex male	0.93	0.85–1.02	0.14
	FTD-1000 m	1.12	0.92–1.38	0.26
	new animal	0.86	0.69–1.06	0.16

Incidence rate ratios (a) were estimated by Poisson random effect models using individual animal follow up period as offset variable. Odds ratios (b, c) were estimated by logistic random effect models. All models include village as random effect to adjust for correlation within villages. Follow up years; sum of all animals (last month sampled - first month sampled), incidence per 100 years = (Number positive/Follow-up years)*100. CI; confidence interval, OR; Odds ratio.