Greedy caliper propensity score matching can yield variable estimates of the treatment‐outcome association—A simulation study

Purpose Greedy caliper propensity score (PS) matching is dependent on randomness, which can ultimately affect causal estimates. We sought to investigate the variation introduced by this randomness. Methods Based on a literature search to define the simulation parameters, we simulated 36 cohorts of d...

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Veröffentlicht in:Pharmacoepidemiology and drug safety 2021-07, Vol.30 (7), p.934-951
Hauptverfasser: Komen, Joris J., Belitser, Svetlana V., Wyss, Richard, Schneeweiss, Sebastian, Taams, Anne C., Pajouheshnia, Romin, Forslund, Tomas, Klungel, Olaf H.
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container_issue 7
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container_title Pharmacoepidemiology and drug safety
container_volume 30
creator Komen, Joris J.
Belitser, Svetlana V.
Wyss, Richard
Schneeweiss, Sebastian
Taams, Anne C.
Pajouheshnia, Romin
Forslund, Tomas
Klungel, Olaf H.
description Purpose Greedy caliper propensity score (PS) matching is dependent on randomness, which can ultimately affect causal estimates. We sought to investigate the variation introduced by this randomness. Methods Based on a literature search to define the simulation parameters, we simulated 36 cohorts of different sizes, treatment prevalence, outcome prevalence, treatment‐outcome‐association. We performed 1:1 caliper and nearest neighbor (NN) caliper PS‐matching and repeated this 1000 times in the same cohort, before calculating the treatment‐outcome association. Results Repeating caliper and NN caliper matching in the same cohort yielded large variations in effect estimates, in all 36 scenarios, with both types of matching. The largest variation was found in smaller cohorts, where the odds ratio (OR) ranged from 0.53 to 10.00 (IQR of ORs: 1.11‐1.67). The 95% confidence interval was not consistently overlapping a neutral association after repeating the matching with both algorithms. We confirmed these findings in a noninterventional example study. Conclusion Caliper PS‐matching can yield highly variable estimates of the treatment‐outcome association if the analysis is repeated.
doi_str_mv 10.1002/pds.5232
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We sought to investigate the variation introduced by this randomness. Methods Based on a literature search to define the simulation parameters, we simulated 36 cohorts of different sizes, treatment prevalence, outcome prevalence, treatment‐outcome‐association. We performed 1:1 caliper and nearest neighbor (NN) caliper PS‐matching and repeated this 1000 times in the same cohort, before calculating the treatment‐outcome association. Results Repeating caliper and NN caliper matching in the same cohort yielded large variations in effect estimates, in all 36 scenarios, with both types of matching. The largest variation was found in smaller cohorts, where the odds ratio (OR) ranged from 0.53 to 10.00 (IQR of ORs: 1.11‐1.67). The 95% confidence interval was not consistently overlapping a neutral association after repeating the matching with both algorithms. We confirmed these findings in a noninterventional example study. Conclusion Caliper PS‐matching can yield highly variable estimates of the treatment‐outcome association if the analysis is repeated.</description><identifier>ISSN: 1053-8569</identifier><identifier>ISSN: 1099-1557</identifier><identifier>EISSN: 1099-1557</identifier><identifier>DOI: 10.1002/pds.5232</identifier><identifier>PMID: 33733533</identifier><language>eng</language><publisher>Chichester, UK: John Wiley &amp; Sons, Inc</publisher><subject>caliper matching ; greedy ; Life Sciences &amp; Biomedicine ; matching ; Medicin och hälsovetenskap ; nearest neighbor matching ; Original ; pharmacoepidemiology ; Pharmacology &amp; Pharmacy ; propensity score ; Public, Environmental &amp; Occupational Health ; Science &amp; Technology ; simulation ; Variation</subject><ispartof>Pharmacoepidemiology and drug safety, 2021-07, Vol.30 (7), p.934-951</ispartof><rights>2021 The Authors. published by John Wiley &amp; Sons Ltd.</rights><rights>2021 The Authors. Pharmacoepidemiology and Drug Safety published by John Wiley &amp; Sons Ltd.</rights><rights>2021. This article is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). 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subjects caliper matching
greedy
Life Sciences & Biomedicine
matching
Medicin och hälsovetenskap
nearest neighbor matching
Original
pharmacoepidemiology
Pharmacology & Pharmacy
propensity score
Public, Environmental & Occupational Health
Science & Technology
simulation
Variation
title Greedy caliper propensity score matching can yield variable estimates of the treatment‐outcome association—A simulation study
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