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Box 1 Calculation of the Water/sanitation, Assets, Maternal education, and Income (WAMI) index (Psaki et al.)

From: Determinants of early child development in rural Tanzania

  Description Range
Water/sanitation Using WHO 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. 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