Table 4. Incidence of malaria parasite infection in low– and high–insecticide resistance clusters by year, Kenya, 2013 and 2014*.

Insecticide resistance	No. children	No. malaria episodes	Total follow-up time, person-years	Incidence, infections/person-year (95% CI)
					Unadjusted			Adjusted
					RR (95% CI)	p value		RR (95% CI)	p value
2013
Low resistance	290	114	51.6	2.2 (1.8–2.7)	1.0			1.0
High resistance	311	116	59.2	2.0 (1.6–2.4)	0.9 (0.5–1.6)	0.70		0.9 (0.5–1.6)	0.68
Per 10% increase in mosquito mortality					1.0 (0.7–1.5)	0.99		1.0 (0.7–1.5)	0.98
2014
Low resistance	433	224	80.7	2.8 (2.4–3.2)	1.0			1.0
High resistance	460	222	80.9	2.7 (2.4–3.1)	1.0 (0.7–1.4)	0.96		0.8 (0.5–1.2)	0.33
Per 10% increase in mosquito mortality					1.0 (0.9–1.1)	0.90		1.1 (0.9–1.2)	0.24

*In 2013, low resistance was defined as mortality >88% and high resistance as mortality <88%. In 2014, low resistance was defined as mortality >67% and high resistance as mortality <67%. RR, rate ratio.