31 Size of ‘Boy’ Coefficient With and Without Controlling for ‘On Ritalin’ Liking SchoolGood at SchoolParental Expectations Boy-0.349*** (0.025) -0.343*** (0.025) -0.257*** (0.023) -0.242*** (0.019) -0.063*** (0.012) -0.057*** (0.013) On Ritalin -0.272*** (0.095) -0.648*** (0.086) -0.234*** (0.048) These estimates are from sibling fixed effects models with covariates included.