Common measures or common metrics? A plea to harmonize measurement results

Edwin de Beurs (Lead / Corresponding author), Jan R. Boehnke, Eiko I. Fried

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)
120 Downloads (Pure)


Objective: There is a great variety of measurement instruments to assess similar constructs in clinical research and practice. This complicates the interpretation of test results and hampers the implementation of measurement-based care.

Method: For reporting and discussing test results with patients, we suggest converting test results into universally applicable common metrics. Two well-established metrics are reviewed: T scores and percentile ranks. Their calculation is explained, their merits and drawbacks are discussed, and recommendations for the most convenient reference group are provided.

Results: We propose to express test results as T scores with the general population as reference group. To elucidate test results to patients, T scores may be supplemented with percentile ranks, based on data from a clinical sample. The practical benefits are demonstrated using the published data of four frequently used instruments for measuring depression: the CES-D, PHQ-9, BDI-II, and the PROMIS depression measure.

Discussion: Recent initiatives have proposed to mandate a limited set of outcome measures to harmonize clinical measurement. However, the selected instruments are not without flaws and, potentially, this directive may hamper future instrument development. We recommend using common metrics as an alternative approach to harmonize test results in clinical practice, as this will facilitate the integration of measures in day-to-day practice.
Original languageEnglish
Pages (from-to)1755-1767
Number of pages13
JournalClinical Psychology and Psychotherapy
Issue number5
Early online date14 Apr 2022
Publication statusPublished - 1 Sept 2022


  • common metrics
  • T score
  • percentile rank
  • self-report measures
  • test result
  • depression


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