Construct Validity of the Physiotherapy Evidence Database (PEDro) Quality Scale for Randomized Trials: Item Response Theory and Factor Analyses

Autor/inn/en	Albanese, Emiliano; Bütikofer, Lukas; Armijo-Olivo, Susan; Ha, Christine; Egger, Matthias
Titel	Construct Validity of the Physiotherapy Evidence Database (PEDro) Quality Scale for Randomized Trials: Item Response Theory and Factor Analyses
Quelle	In: Research Synthesis Methods, 11 (2020) 2, S.227-236 (10 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Zusatzinformation	ORCID (Albanese, Emiliano) ORCID (Armijo-Olivo, Susan)
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1759-2879
DOI	10.1002/jrsm.1385
Schlagwörter	Construct Validity; Physical Therapy; Item Response Theory; Factor Analysis; Randomized Controlled Trials; Rehabilitation; Databases; Scores; Difficulty Level; Psychometrics; Medical Research; Evidence; Item Analysis; Goodness of Fit; Rating Scales + Suchen Sie Ihr Suchwort? Physiotherapie; Item-Response-Theorie; Faktorenanalyse; Datenbank; Schwierigkeitsgrad; Psychometry; Psychometrie; Evidenz; Itemanalyse; Rating-Skala
Abstract	Background: There is an agreement that the methodological quality of randomized trials should be assessed in systematic reviews, but there is a debate on how this should be done. We conducted a construct validation study of the Physiotherapy Evidence Database (PEDro) scale, which is widely used to assess the quality of trials in physical therapy and rehabilitation. Methods: We analyzed 345 trials that were included in Cochrane reviews and for which a PEDro summary score was available. We used one- and two-parameter logistic item response theory (IRT) models to study the psychometric properties of the PEDro scale and assessed the items' difficulty and discrimination parameters. We ran goodness of fit post estimations and examined the IRT unidimensionality assumption with a multidimensional IRT (MIRT) model. Results: Out of a maximum of 10, the mean PEDro summary score was 5.46 (SD = 1.51). The allocation concealment and intention-to-treat scale items contributed most of the information on the underlying construct (with discriminations of 1.79 and 2.05, respectively) at similar difficulties (0.63 and 0.65, respectively). The other items provided little additional information and did not distinguish trials of different quality. There was substantial evidence of departure from the unidimensionality assumption, suggesting that the PEDro items relate to more than one latent trait. Conclusions: Our findings question the construct validity of the PEDro scale to assess the methodological quality of clinical trials. PEDro summary scores should not be used; rather, the physiotherapy community should consider working with the individual items of the scale. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2024/1/01