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This continued down to a one-digit match on propensity scores for those that remained unmatched.
Best matches are those with the highest digit match on propensity score.
The process proceeded sequentially to a single-digit match on propensity score.
The algorithm proceeds sequentially to the lowest digit match on propensity score (1 digit).
We performed a five-digit case control match on propensity score by using SAS™ version 9.1 (SAS Institute Inc., Cary, NC, USA).
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A separate analysis was performed on a subset of procedures from the entire NSQIP sample that was matched on propensity for intraoperative surgical trainee participation.
As matching directly on observable characteristics is difficult if the set of potentially relevant characteristics is large, matching on propensity scores has been proposed as a valid method (Rosenbaum and Rubin, 1983).
After matching on propensity scores, the match quality is evaluated by comparing the means of the T1D group and the matched control group.
Confounding minimised by use of matching on propensity score.
First, the cohorts were matched on propensity scores allowing a range of ±0.005.
Lastly, risk estimates remained unchanged when treated and untreated participants were matched on propensity score (supplementary table C).
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