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Addis Ababa age categories analysis August 1997 August average monthly income average number control variable daily wage equation Daily wages earned disaggregated economic impact economic productivity employment type i.e. endemic equal average monthly equal medians errors in parentheses estimate the labor Female fewer days Function for Permanent Impact of Onchocercal impact of OSD independent variables Instrumental Variables Estimation Ivermectin Labor Supply Function latest 12 months log of average non-blinding number of days older plantation workers onchocercal skin disease Onchocerciasis Coordination Ordinary Least Square OSD Severity OSD-related permanent workers plantation in southwest plantation records Policy Research regression represents statistical significance Research Working Paper savanna September 1997 September Severe OSD severe-OSD permanent employees severity of OSD southwest Ethiopia Standard errors t-test with unequal temporary workers Teppi coffee plantation test for equal type of employment unequal variances Variables All Age Vector of control wages equal average Wilcoxon rank-sum test World Bank World Health Organization