Evidence for Psoriatic Arthritis Impact of Disease (PsAID12) as Core Instrument to Measure Health-Related Quality of Life in Psoriatic Arthritis: A Systematic Review of Psychometric Properties
Bibliographic record
Abstract
Objective: To evaluate and update the evidence for the measurement properties of the Psoriatic Arthritis Impact of Disease (PsAID12) questionnaire to measure health-related quality of life (HRQoL) in psoriatic arthritis (PsA). Methods: The PsAID12 psychometric evidence was gathered in a systematic literature review in PsA (registration number: CRD42016032546). The study quality was appraised using the Consensus-based Standards for the selection of health Measurement Instruments–Outcome Measures in Rheumatology (COSMIN-OMERACT) good methods check-list. Content validity, test–retest reliability, construct validity, longitudinal construct validity, discrimination, and thresholds of meaning were appraised. Additional analyses for construct validity, responsiveness, and sensitivity to change were conducted in available observational data sets after prespecified hypotheses were formulated. Results: Eight publications (129-474 patients) were analyzed. The PsAID12 fulfilled OMERACT criteria for content validity (patients and physicians endorsed content match with PsA HRQoL domain), feasibility (endorsed by patients and physicians), and test–retest reliability (intraclass correlation coefficient: 0.91-0.95). A priori construct validity hypotheses were mostly met: Psoriatic Arthritis Impact of Disease had high correlation with generic ( r = 0.76-0.87) and PsA-specific HRQol measures (0.8), and with measures of physical function (0.66-0.72), work productivity (0.69-0.75), pain (0.83), and fatigue (0.84). Psoriatic Arthritis Impact of Disease had moderate-high correlation with measures of patient global (0.49-0.84) and dermatologic HRQoL (0.36-0.53). Correlations were higher with generic HRQoL measured by short form-36 physical component score (0.47-0.73) versus short form-36 mental component score (0.22-0.60). Three studies confirmed known group validity of PsAID12 according to PsA disease activity. Psoriatic Arthritis Impact of Disease discriminated between change groups in 2 longitudinal studies (standardized response mean: 0.74-0.91, 53 and 105 patients). The minimal clinically important improvement was 3 and 1.4 points. Conclusion: Psoriatic Arthritis Impact of Disease had evidence for good content and construct validity, reliability, and longitudinal construct validity and is ready to evaluate in clinical trials.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.028 | 0.111 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.008 | 0.010 |
| Bibliometrics | 0.017 | 0.014 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.004 | 0.003 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.003 | 0.002 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".