Measurement properties and interpretability of the Patient-Reported Impact of Dermatological Diseases (PRIDD) measure

Pattinson, Rachael ORCID: https://orcid.org/0000-0002-3145-3710, Trialonis-Suthakaran, Nirohshah, Pickles, Timothy ORCID: https://orcid.org/0000-0001-7743-0234, Austin, Jennifer, FitzGerald, Allison, Augustin, Matthias and Bundy, Christine ORCID: https://orcid.org/0000-0002-5981-3984 2024. Measurement properties and interpretability of the Patient-Reported Impact of Dermatological Diseases (PRIDD) measure. British Journal of Dermatology 10.1093/bjd/ljae267

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Abstract

Background Patient-reported outcome measures (PROMs) are crucial for assessing the impact of dermatological conditions on patients’ lives, but the existing dermatology-specific PROMs are not recommended for use according to the Consensus-based Standards for the Selection of Health Measurement Instruments (COSMIN). We developed the Patient-Reported Impact of Dermatological Diseases (PRIDD) measure in partnership with patients. It has strong evidence of content validity, structural validity, internal consistency, acceptability, and feasibility. Objectives To test PRIDD’s remaining measurement properties and establish the interpretability of scores against the COSMIN criteria using classic and modern psychometric methods. Methods A global longitudinal study consisting of two online surveys administered two to four weeks apart. Adults (≥ 18 years) living with a dermatological condition were recruited through the International Alliance of Dermatology Patient Organizations’ (GlobalSkin) membership network. Participants completed PRIDD, a demographics questionnaire, and other related measures including the Dermatology Life Quality Index (DLQI). We tested PRIDD’s criterion validity, construct validity and responsiveness (Spearman’s ρ, independent-samples t-tests and ANOVA), test-retest reliability (interclass correlation coefficient [ICC]), measurement error (Smallest Detectable Change or Limits of Agreement [LoA], distribution-based Minimally Important Change [MIC]), floor and ceiling effects (number of minimum and maximum scores and Person-Item Location Distribution Maps), score bandings (κ coefficient of agreement) and anchor-based MIC. Results 504 patients with 35 dermatological conditions from 38 countries participated. Criterion validity (ρ = 0.79), construct validity (76% hypotheses met), test-retest validity (ICC = 0.93), and measurement error (LoA = 1.3 < MIC = 4.14) were sufficient. Floor and ceiling effects were in the acceptable range (< 15%). Score bandings were determined (κ = 0.47), however, the anchor-based MIC could not be calculated due to an insufficient anchor. Conclusions PRIDD is a valid and reliable tool to evaluate the impact of dermatological disease on patients’ lives in research and clinical practice. It is the first dermatology-specific PROM to meet the COSMIN criteria. These results support the value of developing and validating PROMs with a patient-centred approach and using classic and modern psychometric methods. Further testing of responsiveness and MIC, cross-cultural translation, linguistic validation, and global data collection are planned.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Centre for Trials Research (CNTRR) Dentistry Healthcare Sciences
Subjects:	B Philosophy. Psychology. Religion > BF Psychology R Medicine > RL Dermatology
Publisher:	Oxford University Press
ISSN:	0007-0963
Funders:	International Alliance of Dermatology Patient Organisations (GlobalSkin)
Date of First Compliant Deposit:	11 July 2024
Date of Acceptance:	18 June 2024
Last Modified:	12 Nov 2024 10:30
URI:	https://orca.cardiff.ac.uk/id/eprint/169910

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