Library of risk of bias tools


Study design(s) targeted by the tool Reliability studiesreliability-study
Additional details on designs Measurement properties of PROMS: Used to assess risk of bias of any study on measurement properties (e.g. reliability studies, validity studies, responsiveness studies).
Tool area Health
Link to the tool Get the COSMIN-PROMS tool


Primary publication Mokkink LB, de Vet HCW, Prinsen CAC, Patrick DL, Alonso J, Bouter LM, et al. COSMIN Risk of Bias checklist for systematic reviews of Patient-Reported Outcome Measures. Quality of Life Research. 2018;27(5):1171-9.
DOI 10.1007/s11136-017-1765-4
Guidance document See website and training entry below for latest versions of guidance

Guidance documents

See website for latest versions of guidance (

Manual for assessing content validity (

Manual describing all other 8 measurement properties (


See website for latest versions of training (

COSMIN Training Resources

EpidM course on clinimetrics is available Training Resources

Language English

Translations available from

Record last updated 23/02/2024

Related tools and Publications

Previous versions


Updated versions


Related tools

Note the alternative COSMIN tool for assessment of the quality of studies on reliability or measurement error of outcome measurement instruments (COSMIN risk of bias)

COSMIN tool for studies of measurement error


None known – pleaseĀ contact us if you are aware of any evaluations that should be listed here.

Other publications

None known – pleaseĀ contact us if you are aware of any publications that should be listed here.

Key Criteria

Focuses on risk of bias, or makes a distinction between items that assess risk of bias and other aspects of study quality Yes
Offers a method to reach either a domain specific or overall assessment of risk of bias Yes
Tool development involving a range of stakeholders from different disciplines (e.g. methodologists, statisticians, clinicians) Yes
Avoids recommending use of summary numerical quality scores Yes