Collecting patient-reported outcomes via the COTIDIANA smartphone app: a prospective validity study
Authors' conclusion
Reliability was particularly stable at shorter intervals with more variation over time. Convergent validity was high between daily and weekly assessment.
Study context
- Population
- Outpatients ≥18 years with Sjögren's disease (SjD), osteoarthritis (OA) or psoriatic arthritis (PsA) completing short daily and weekly smartphone electronic patient-reported outcomes (ePROMs) (VAS: PGA, pain, anxiety and depression, fatigue, sleep) for 14 days76.12% female
- Participants
- 48 outpatients
- Exposure
- SjD vs PsA vs OA
- SjDn = 18
- PsAn = 20
- OAn = 10
- Outcome
- Test-retest reliability (ICC, SDD) for 1-6-day intervals; convergent validity of daily vs weekly ePROMs
- Follow-up
- 14 days
Methodological detailssingle-centre
- Single-centre
Main finding
As reported in the abstract
Test-retest reliability of ePROMs
- 1-day interval intraclass correlation (ICC), all domains
- 0.84 and 0.89
- 1-day interval SDD, all domains
- 1.04 to 2.10
- 6-day interval ICC
- 0.23 to 0.73
- 6-day interval SDD
- 1.89 to 2.88
- 1-, 2- and 3-day intervals ICC (high reliability)
- 0.83-0.98
Observational data: associations, not effects.
Further findings
Convergent validity: correlation of daily with weekly ePROM
- Pain
- 0.97
- Anxiety and depression
- 0.94
- Fatigue
- 0.90
- Sleep
- 0.95
- PGA
- 0.94
Original publication
Collecting patient-reported outcomes via the COTIDIANA smartphone app: a prospective validity study. RMD Open. Published 27 June 2025. doi:10.
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