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An item response theory analysis of an item pool for the recovering quality of life (ReQoL) measure
- Source :
- Keetharuth, A D, Bjorner, J B, Barkham, M, Browne, J, Croudace, T & Brazier, J 2021, ' An item response theory analysis of an item pool for the recovering quality of life (ReQoL) measure ', Quality of Life Research, vol. 30, no. 1, pp. 267-276 . https://doi.org/10.1007/s11136-020-02622-2, Quality of Life Research
- Publication Year :
- 2020
- Publisher :
- Springer Science and Business Media LLC, 2020.
-
Abstract
- Purpose ReQoL-10 and ReQoL-20 have been developed for use as outcome measures with individuals aged 16 and over, experiencing mental health difficulties. This paper reports modelling results from the item response theory (IRT) analyses that were used for item reduction. Methods From several stages of preparatory work including focus groups and a previous psychometric survey, a pool of items was developed. After confirming that the ReQoL item pool was sufficiently unidimensional for scoring, IRT model parameters were estimated using Samejima’s Graded Response Model (GRM). All 39 mental health items were evaluated with respect to item fit and differential item function regarding age, gender, ethnicity, and diagnosis. Scales were evaluated regarding overall measurement precision and known-groups validity (by care setting type and self-rating of overall mental health). Results The study recruited 4266 participants with a wide range of mental health diagnoses from multiple settings. The IRT parameters demonstrated excellent coverage of the latent construct with the centres of item information functions ranging from − 0.98 to 0.21 and with discrimination slope parameters from 1.4 to 3.6. We identified only two poorly fitting items and no evidence of differential item functioning of concern. Scales showed excellent measurement precision and known-groups validity. Conclusion The results from the IRT analyses confirm the robust structure properties and internal construct validity of the ReQoL instruments. The strong psychometric evidence generated guided item selection for the final versions of the ReQoL measures.
- Subjects :
- Male
Adolescent
Psychometrics
Item response theory
behavioral disciplines and activities
Article
03 medical and health sciences
0302 clinical medicine
Quality of life (healthcare)
Humans
030212 general & internal medicine
Medical diagnosis
030503 health policy & services
Public Health, Environmental and Occupational Health
Construct validity
Mental health
Differential item functioning
Quality of Life
Female
0305 other medical science
Psychology
Construct (philosophy)
Recovering quality of life
Clinical psychology
Subjects
Details
- ISSN :
- 15732649 and 09629343
- Volume :
- 30
- Database :
- OpenAIRE
- Journal :
- Quality of Life Research
- Accession number :
- edsair.doi.dedup.....dcf824f10ea18b4ae65cf1e0130dd8e5