Table 5. Incidence of Plasmodium infections by study area (non-LCI and LCI sites), stratified by cross-sectional surveys at baseline and during intervention period, 2004–2007^a.

Survey period	Non-LCI sites				LCI sites				RR	95% CI
	Rb	Incidencec	95% CI		Rb	Incidencec	95% CI
Baseline
Apr–Jun 2004	40/140	285.7	272.1–300.1		30/164	182.9	171.4–195.3		1.56	1.31–1.86
Nov 2004–Jan 2005	22/232	94.8	86.7–103.7		24/174	1379	127.1–149.7		0.69	0.53–0.89
Apr–Jun 2005	27/184	146.7	136.5–157.8		34/210	161.9	152.8–171.5		0.91	0.73–1.12
Intervention
Nov 2005–Jan 2006	18/278	64.7	61.7–68.0		8/266	30.1	28.2–32.1		2.15	1.40–3.31
Apr–Jun 2006	30/312	96.2	88.0–105.1		9/272	331	30.5–35.9		2.91	1.96–4.30
Nov 2006–Jan 2007	8/394	20.3	18.9–21.8		14/348	40.2	38.0–42.6		0.50	0.30–0.86

CI, confidence interval; LCI, larval control intervention; R, rate; RR, rate ratio.
^a The analysis is based on study children aged 9 months to 13 years, that attended both the first and follow-up visit of a survey and were negative for parasites at the first visit. Data from children who attended only one visit of any survey or were already positive for parasites at the first visit are not included here.
^b Children positive for parasites at follow-up divided by children negative for parasites at the first survey.
^c Per 1000 child months at risk.