Evidence map›Paper›PMID 30411349›Full record

ArticleHealth services research2019

Comparison group selection in the presence of rolling entry for health services research: Rolling entry matching.

Allison Witman, Christopher Beadles, Yiyan Liu, Ann Larsen, Nilay Kafali, Sabina Gandhi, Peter Amico, Thomas Hoerger

Abstract read
In one paragraph

Article in Health services research, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.

0numbers the graph read from it
0cells of the map it votes in
10citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

10 citing papers in PubMed.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors.

Allison WitmanCameron School of Business, University of North Carolina Wilmington, Wilmington, North Carolina.ORCID 0000-0001-7467-2369
Christopher BeadlesRTI International, Research Triangle Park, North Carolina.
Yiyan LiuRTI International, Waltham, Massachusetts.
Ann LarsenRTI International, Waltham, Massachusetts.
Nilay KafaliDepartment of Economics, Boston University, Boston, Massachusetts.
Sabina GandhiRTI International, Washington, District of Columbia.
Peter AmicoAmico Consulting, Orlando, Florida.
Thomas HoergerRTI International, Research Triangle Park, North Carolina.

Funding

Centers for Medicare and Medicaid Services HHSM-500-2010-00021IRTI International
6 · The paper itself

Abstract

objectiveTo demonstrate rolling entry matching (REM), a new statistical method, for comparison group selection in the context of staggered nonuniform participant entry in nonrandomized interventions. STUDY

settingFour Health Care Innovation Award (HCIA) interventions between 2012 and 2016. STUDY

designCenter for Medicare and Medicaid Innovation HCIA participants entering these interventions over time were matched with nonparticipants who exhibited a similar pattern of health care use and expenditures during each participant's baseline period. DATA EXTRACTION

methodsMedicare fee-for-service claims data were used to identify nonparticipating, fee-for-service beneficiaries as a potential comparison group and conduct REM. PRINCIPAL

findingsRolling entry matching achieved conventionally-accepted levels of balance on observed characteristics between participants and nonparticipants. The method overcame difficulties associated with a small number of intervention entrants.

conclusionsIn nonrandomized interventions, valid inference regarding intervention effects relies on the suitability of the comparison group to act as the counterfactual case for the intervention group. When participants enter over time, comparison group selection is complicated. Rolling entry matching is a possible solution for comparison group selection in rolling entry interventions that is particularly useful with small sample sizes and merits further investigation in a variety of contexts.

Indexed as

Data Interpretation, StatisticalFee-for-Service PlansHealth Services ResearchHumansMedicareResearch DesignUnited Statescausal inferencecomparison groupsmatchingmethodspropensity scores

Identifiers

PMID30411349
PMCPMC6407360

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.