Skip to main content

Table 3 Average daily step count differences by level of trackable wear compliance and gout flare classification

From: Physical activity measured using wearable activity tracking devices associated with gout flares

Wearable tracker compliance classification Gout flare classification definition Participants, flare days Participants, non-flare days Mean ± SD step count on flare days Mean ± SD step count on non-flare days Adjusted difference * (p value)
Compliant wear with sleep Single item Subjects = 25
Total days = 442
Subjects = 29
Total days = 1791
5900 ± 4071 6973 ± 5214 Δ = − 841 (p < 0.0001)
Compliant wear with sleep + Compliant wear without sleep Single item Subjects = 29
Total days = 504
Subjects = 30
Total days = 1991
6171 ± 4096 7007 ± 5173 Δ = − 675 (p = 0.0007)
All available Fitbit data, ignoring wear pattern Single item Subjects = 31
Total days = 666
Subjects = 30
Total days = 2547
5330 ± 4090 6236 ± 5032 Δ = − 472 (p = 0.0121)
Compliant wear with sleep Validated Subjects = 21
Total days = 383
Subjects = 29
Total days = 1791
5930 ± 3983 6973 ± 5214 Δ = − 864 (p < 0.0001)
Compliant wear with sleep + Compliant without sleep Validated Subjects = 24
Total days = 439
Subjects = 30
Total days = 1991
6173 ± 3984 7007 ± 5173 Δ = − 718 (p = 0.0008)
All available Fitbit data, ignoring wear pattern Validated Subjects = 27
Total days = 559
Subjects = 30
Total days = 2547
5482 ± 3977 6236 ± 5032 Δ = − 396 (p = 0.0542)
  1. Compliant wear with sleep = > 80% of 1440 min recorded. Compliant wear without sleep = > 80% of 960 min = recorded; all available data = partial wear (= wear minutes > 60 < 800 recorded) + compliant wear with sleep + compliant wear without sleep
  2. *To estimate p value, mixed linear models were used to adjust estimation for repeated observations for an individual