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The PEDro scale is a valid measure of the methodological quality of clinical trials: a demographic study
Open accessAbstract
Questions Does the PEDro scale measure only one construct ie, the methodological quality of clinical trials? What is the hierarchy of items of the PEDro scale from least to most adhered to? Is there any effect of year of publication of trials on item adherence? Are PEDro scale ordinal scores equivalent to interval data?Design Rasch analysis of two independent samples of 100 clinical trials from the PEDro database scored using the PEDro scale.Results Both samples of PEDro data showed fit to the Rasch model with no item misfit. The PEDro scale item hierarchy was the same in both samples, ranging from the most adhered to item random allocation, to the least adhered to item therapist blinding. There was no differential item functioning by year of publication. Original PEDro ordinal scores were highly correlated with transformed PEDro interval scores (r = 0.99).Conclusion The PEDro scale is a valid measure of the methodological quality of clinical trials. It is valid to sum PEDro scale item scores to obtain a total score that can be treated as interval level measurement and subjected to parametric statistical analysis.
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The PEDro scale is a valid measure of methodological quality for clinical trials.
“The PEDro scale has shown to be a valid measure of methodological quality of clinical trials [24].”
From Effectiveness of non-pharmacological conservative therapies in adults with fibromyalgia: A systematic review of high-quality clinical trials (2022) · cites this paper as [24]
Risk of bias was assessed using a modified PEDro scale with blinding items 5-7 removed, giving a maximum score of 7.
“Risk of bias due to study quality was assessed using the Physiotherapy Evidence Database (PEDro) scale [11].”
From Comparison of concurrent, resistance, or aerobic training on body fat loss: a systematic review and meta-analysis. (2025) · cites this paper as [11]
Two independent, blinded reviewers assessed methodological quality using the PEDro scale.
“Two independent, blinded reviewers used the PEDro scale, a valid and reliable measure of methodological quality, to assess the quality of the articles [16,17].”
Study quality was evaluated using the 11-item PEDro Scale.
“Study quality was evaluated using the 11‐item PEDro Scale (de Morton 2009).”
From Gastrointestinal Symptoms Associated With Sodium Bicarbonate Supplementation Protocols: A Systematic Review (2026) · cites this paper as de Morton 2009
The PEDro scale is a valid and reliable tool to rate the internal study validity and methodological quality of controlled studies.
“The PEDro scale is a valid and reliable tool to rate the internal study validity and methodological quality of controlled studies15.”
From Dose-response-relationship of stabilisation exercises in patients with chronic non-specific low back pain: a systematic review with meta-regression (2020) · cites this paper as [15]
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Metadata
- Authors
- de Morton, N. A.
- Venue
- Australian Journal of Physiotherapy
- Publisher
- Elsevier BV
- Published
- 2009
- Volume
- 55
- Issue
- 2
- Pages
- 129-133
- ISSN
- 0004-9514 (ISSN-L)
- OpenAlex
- W2127818482
- Cited by
- 2,201
- References
- 11
- Citations by year
- 2026: 166 · 2025: 221 · 2024: 261 · 2023: 249 · 2022: 247 · 2021: 181 · 2020: 175 · 2019: 136 · 2018: 121 · 2017: 83 · 2016: 70 · 2015: 89 · 2014: 59 · 2013: 53 · 2012: 38
- FWCI
- 36.93
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Australian Journal of Physiotherapy (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Meta-analysis and systematic reviews
- Social Sciences › Decision Sciences › Management Science and Operations Research › Psychometric Methodologies and Testing
- Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods in Clinical Trials
- Keywords
- PEDro scale, methodological quality, clinical trials, scale validity, Rasch analysis, item hierarchy, differential item functioning, randomization, publication year
- MeSH terms
- Clinical Trials as Topic, Data Interpretation, Statistical, Follow-Up Studies, Humans, Random Allocation, Outcome Assessment, Health Care, Physical Therapy Specialty
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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