Fig. 5

Sensitivity analysis of the estimated effect of selective schooling on the health outcomes self-reported at mid-life. Analyses are (1) using higher weights for those closer to the cut-point (triangular); (2) using equal weights; (3) including confounders of sex, IQ at age 9, and father’s occupation; (4) including the 3048 people in the base sample for whom secondary school was not known using inverse-probability weighting; (5) excluding those whose probability of attending selective secondary was not 0 or 100% (donut analysis); and (6) including the entire population equally weighted. Each of these variations was evaluated for first-, second-, or third-order polynomials of the 11+ exam score. Each sensitivity analysis effect estimate is represented as a point with associated 95% confidence intervals