Every 100 dollars spent on the programme provided a total of ten years of additional school attendance among all students, enabling a child to spend an extra day in school. It cost just five cents. The kids who got the d worming were slightly taller, theyre slightly heav or. They also had lower rates of anemia. This is from m caskell's bo when kramer's colleagues followed up with the children, ten years later, those who had been dewormed were working in extra three point four hours per week and earning an extra 20 % of income compared to those who had not been de wormed.