ABCDEFGHIJ
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ValueSource
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Inputs
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Discount rate4%GiveWell's 2020 Cost-effectiveness analysis - version 2
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Duration of long term benefits of deworming (years) - also used for iodine40GiveWell's 2020 Cost-effectiveness analysis - version 2
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Cost per person per year$0.10
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Internal validity (IV)80%
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External validity (EV)70%
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Leverage (dollars of impact per dollars spent)100%
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% of benefit of iodine that lasts for the long term80%
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Household coverage achieved66%
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Probability that GAIN/ICCIDD has an impact50%
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% of children that benefit80%
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Equivalent increase in wages from having iodine throughout childhood3.60%
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Fixed assumptions
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Years of Childhood (for iodine)15By definition
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Percent of population under 1543%World Bank data, Population ages 0-14 (% of total population) - Sub-Saharan Africa, 2014
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Benefits of iodine
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Benefit on one year's income (discounted back 10 years because of delay between intervention and working for income)0.0195
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Present value of the sum of the lifetime benefits per worker (in terms of Ln(income))0.4005
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Present value of the sum of the lifetime benefits per worker (in terms of Ln(income)), with IV/EV adjustments0.2243
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Total benefits (Ln(income)) per person per year of treatment, adjusted for coverage and targeted population0.0034
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Total units of increase in ln(consumption) per dollar0.0170
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Results
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Total units of increase in ln(consumption), per $100,000 donation to salt iodization1,697.34
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Value assigned to increasing ln(consumption) by one unit for one person for one year
1.44GiveWell 2020 Cost-effectiveness analysis - version 2
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Total units of value generated with hypothetical donation ($100,000) to salt iodization2,444.17
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Total units of value generated with hypothetical donation ($100,000) to GiveDirectly (unconditional cash transfers)344.00GiveWell 2020 Cost-effectiveness analysis - version 2
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Salt iodization vs cash7.11
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Note: The original version of this CEA was published in Dec 2014 and can be downloaded here. Moral weights were updated in Feb 2021, but other aspects of the CEA have not been updated.
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