Epidemiology of forest malaria in central Vietnam: a large scale cross-sectional survey.

Even if wooden and bricks houses showed a trend for a protective effect, only dried mud houses had a significant and strong protective effect and this might be due to their architecture as windows are extremely small and might reduce the human/vector contact.

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There was a decreasing trend for the odds of malaria infection with increasing socio-economic status, the highest category had about 50% lower malaria risk compared to the poorest one.

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Thus, even if residual confounding might have occurred, it is unlikely that it would greatly change the results, since there is a clear trend for decreasing odds of malaria infections with increasing level of socio-economic status.

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