Decomposition of the estimated gains in expected months lived from age 18 to 66 years into treatment and selection effects, on observables and selection on cognitive ability.

Change in expected months lived over the age range 18–66 years. Treatment effect: estimated gain from structural model. Selection effect: remaining difference from implied life expectancy based on Kaplan-Meier curves. Observed: selection effect due to difference in observed individual characteristics. Intelligence: selection effect due to difference in intelligence. 95% confidence interval within brackets. Significance: *p Decomposition of the estimated gains in expected months lived from age 18 to 66 years into treatment and selection effects, on observables and selection on cognitive ability.