Table 2.

Effects of sleeping in an IRS-treated house, sleeping under net/ITN, unadjusted, and adjusted for each other and effect of proxy for wealth status of household on infection with Plasmodium falciparum in children 2 to < 15 years of age in Zambezia province, Mozambique, and Bioko, Equatorial Guinea^*

		Percent infected	Number	OR	95% CI	P value	Adjusted OR	95% CI	P value
Bioko, 2008
Living in IRS-treated dwelling#
	No	29	496	1.00			1.00
	Yes	21	2631	0.65	0.46–0.92	0.017	0.68†	0.48–0.94	0.024
Slept under ITN#
	No	27	860	1.00			1.00
	Yes	20	2267	0.66	0.46–0.94	0.025	0.68‡	0.48–0.97	0.033
Electric lights§	No	22	1076	1.00			¶
	Yes	22	2051	1.02	0.62–1.66	0.940
Zambezia, 2007
Living in IRS-treated dwelling††
	No	71	827	1.00			1.00
	Yes	55	1617	0.50	0.28–0.87	0.018	0.49**	0.28–0.88	0.019
Slept under net††
	No	64	1622	1.00			1.00
	Yes	55	822	0.71	0.53–0.95	0.025	0.70‡	0.54–0.90	0.009
Household has radio§	No	64	991	1.00			¶
	Yes	58	1453	0.77	0.59–1.01	0.056

^*IRS = indoor residual spraying; ITN = insecticide-treated net; OR = odds ratio; CI = confidence interval.

^†Adjusted for effect of sleeping under an ITN or long-lasting insecticidal net (LLIN).

^‡Adjusted for effect of sleeping in an IRS-treated house.

^§Proxy for wealth of household.

^¶Electric lights and household radio not included in multiple variable models due to absence of effect as confounder, and large P values.

^#No evidence of effect modification (interaction) between IRS and net use effects (P = 0.493).

^**Adjusted for effects of sleeping under any net.

^††No evidence of effect modification (interaction) between IRS and ITN use effects (P = 0.976 ).