Researchers conducted long-term follow-ups a mass school-based deworming program in western Kenya, which had substantially improved health and school participation of treated children, as well as of untreated children in treatment schools and children in neighboring schools in the short-term. Approximately ten years after treatment, researchers found that the program increased women’s educational attainment and men’s labor supply, with accompanying shifts in occupation choice. Twenty years after treatment, earnings, spending, and time spent working outside of agriculture had improved.