Determinants of locally acquired malaria infections in Zanzibar: a cross-sectional study.

Prevalence was also higher in individuals who reported going to sleep between 18:00 and 20:59 (27% of participants) compared to those who reported to sleep later (Table 2 and Additional file: Table S2). Household characteristics Malaria prevalence was highest among index household members (12.4%, 95% CI 10.4–14.7) and higher in households in which index cases had travelled (21.1%, 95% CI 7.6–46.5; N = 19), though the difference did not reach statistical significance ( OR = 2.1, 95% CI 0.6–8.0, P = 0.267).

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