- Modest agreement with physicians: Correlation was higher for tender joints (r = 0.5) than swollen joints (r = 0.33).
- Patients reported more affected joints: Rheumatologists consistently recorded fewer tender and swollen joints than patients.
- Better at confirming low disease activity: Patient-derived scores had high positive predictive value (95%) and specificity (94%) for low disease activity/remission.
- Limited ability to detect active disease: Negative predictive value was 50% with sensitivity of 54%, indicating poor performance for identifying active disease.
- Training and context likely affect accuracy: Variability may reflect differences in patient environment, timing of assessments, and limitations of app-based training compared with in-person instruction.
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