Table 2. Relative risks (RR) and respective 95% CI for the effect of interventions on the 18-month cumulative incidence of infection, using both intent-to-treat and per-protocol analyses.

	Intent-to-treat analysis
Intervention group	RRa	95% CI	p-value	RRb	95% CI	p-value
Insecticide spraying	0.76	0.54–1.05	0.094	0.86	0.63–1.16	0.310
Dog culling	0.60	0.40–0.90	0.014	0.62	0.42–0.91	0.015
Dog culling+Insecticide spraying	0.69	0.45–1.06	0.087	0.75	0.51–1.11	0.153
Control	1.00

^a Crude.

^b Adjusted for sex, age, baseline prevalence of infection, years of living in the residence, presence of a chicken shed in the peridomestic environment, literacy of the household head and the presence of a kennel in the peridomestic environment.