Objective
To explore the frequency of self-reported flares and their association with preceding symptoms collected through a smartphone app by people with rheumatoid arthritis (RA).
Methods
We used data from the Remote Monitoring of Rheumatoid Arthritis (REMORA) study, where patients tracked their daily symptoms and weekly flares on an app. We summarised the number of self-reported flare weeks. For each week preceding a flare question, we calculated three summary features for daily symptoms: mean, variability and slope. Mixed effects logistic regression models quantified associations between flare weeks and symptom summary features. Pain was used as an example symptom for multivariate modelling.
Results
Twenty patients tracked their symptoms for a median of 81 days (interquartile range 80, 82). 15/20 participants reported at least one flare week, adding up to 54 flare weeks out of 198 participant weeks in total. Univariate mixed effects models showed that higher mean and steeper upward slopes in symptom scores in the week preceding the flare increased the likelihood of flare occurrence, but the association with variability was less strong. Multivariate modelling showed that for pain, mean scores and variability were associated with higher odds of flare, with odds ratios 1.83 (95% confidence interval, 1.15–2.97) and 3.12 (95% confidence interval, 1.07–9.13), respectively.
Conclusion
Our study suggests that patient-reported flares are common and are associated with higher daily RA symptom scores in the preceding week. Enabling patients to collect daily symptom data on their smartphones may ultimately facilitate prediction and more timely management of imminent flares.