The sample size for the 2nd objective was calculated using the double population proportion formula, with an assumption of power = 80%, 5% non-response rate, design effect = 2 through identifying highly significant variables (wealth index and educational status) from previous studies. 26 , 27 The proportion of willingness to pay among the non-exposed group through taking wealth index as a factor was 18.9%, OR=0.21, and for a non-exposed group of educational status was 8.2%, OR=4.5; sample sizes for these factors were 391 and 286, respectively.
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Mothers' Acceptance and Willingness to Pay an Out-of-Pocket Payment for Maternal and Child Nutritional Services in Northwest Ethiopia.
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