Propensity score analysis (PSA; [34,35]) was conducted comparing separated and intact families stratified by predicted probability of separation. PSA is an increasingly popular statistical technique to reduce bias from confounders where groups are matched on a range of predictors. To the extent that intact and separated families are observed to be well-matched, our confidence in results of survival-analytic comparisons is increased. Where matching is less successful, our confidence in such comparisons is reduced.
