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The magnitude of the non-coverage bias, or the relative change in population-level estimates of dietary diversity by only surveying women with mobile phones, was estimated as RelativeBias=N2N1(Y-1-Y-2)Y-1 Where Y-1 and Y-2 are the mean MDD-W scores for women with and without phone access, respectively, and (N2N1) is the proportion of women without access to mobile phones [53].
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