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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