I have the data of 670 respondents from the baseline evaluation survey before the intervention in 2013. This was a community-based approach intervention for combatting child stunting and malnutrition. The main predictors were the mother's height and weight, breastfeeding duration, educational status, etc.
I plan to use the same instrument in the same region among mothers of children from 6 months to 6 years old (same year group as in 2013). Back then, the sample was divided into two strata - children aged from 6 to 24 months and from 24 to 72 months.
The study objective is to evaluate the significant improvement in stunting predictor variables over 10 years. So, how I should calculate the sample this time?
Thanks in advance!
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