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Table 5 Calculation of the Water/sanitation, Assets, Maternal education, and Income (WAMI) index

From: Measuring socioeconomic status in multicountry studies: results from the eight-country MAL-ED study

  Description Range
Water/sanitation Using World Health Organization definitions of access to improved water and improved sanitation, households with access to improved water or improved sanitation are assigned a score of 4 for each. Households without access to improved water or improved sanitation are assigned a score of 0 for each. These scores were summed. 0-8
Assets Eight priority assets were selected using random forests with HAZ as the outcome. For each asset, households were assigned a 1 if they have the asset and 0 if they do not have the asset. These scores were summed. 0-8
Maternal education Each child’s mother provided the number of years of schooling she had completed, ranging from 0 to 16 years. This number was divided by 2. 0-8
Income Monthly household income was converted to US dollars using the exchange rate from January 1, 2010. Income was divided into octiles using the following scores and cutoffs: 1 (0–26), 2 (26.01-47), 3 (47.01-72), 4 (72.01-106), 5 (106.01-135), 6 (135.01-200), 7 (200.01-293), 8 (293+). 0-8
TOTAL Scores in water and sanitation, assets, mother’s education, and income were summed then divided by 32. 0-1