Table 3. Effect modification of the larviciding intervention by selected determinants of malaria prevalence in Dar es Salaam, 2004–2008 (N = 64,537).

Effect modification of the larviciding intervention by selected determinants of malaria infection (Odds Ratio and 95% Credible Intervals)*
	Control	Larviciding	Effect of Larviciding Within Strata
Wet Season	1.00	1.06 (0.84–1.33)	1.06 (0.84–1.33)
Dry Season §	0.97 (0.69–1.10)	0.57 (0.41–0.77)	0.60 (0.47–0.75)
	Control	Larviciding	Effect of Larviciding Within Strata
No Screen	1.00	0.84 (0.70–1.02)	0.84 (0.70–1.02)
Window Screens	0.93 (0.85–1.02)	0.80 (0.65–0.99)	0.68 (0.54–0.85)
	Control	Larviciding	Effect of Larviciding Within Strata
Open Ceiling	1.00	0.84 (0.70–1.01)	0.84 (0.70–1.01)
Complete Ceiling	0.97 (0.88–1.06)	0.78 (0.63–0.97)	0.66 (0.53–0.83)
	Control	Larviciding	Effect of Larviciding Within Strata
No ITN	1.00	0.83 (0.69–0.99)	0.83 (0.69–0.99)
ITN used	0.96 (0.88–1.04)	0.77 (0.61–0.96)	0.63 (0.48–0.82)
	Control	Larviciding	Effect of Larviciding Within Strata
Aged ≥5 years	1.00	0.83 (0.69–0.99)	0.83 (0.69–0.99)
<5 years of age	1.35 (1.23–1.47)	0.73 (0.56–0.94)	0.61 (0.46–0.80)

Statistically significant results are bolded.

All models are adjusted for age, sex, sleeping outside of the ward (previous 2 weeks), being treated for malaria in a previous round, use of malaria drugs (previous 2 weeks), use of ITN, complete ceiling, window screen, precipitation, time trend. Random effects at household and TCU levels are also included.

^§Dry season is defined as the months of January, February, and June through September.