Table 1 Parameters used in linear mixed effects models to study change over time and correlation with weight loss during the intervention
Domain | Variable name | Abbr | Unit | Variable explanation | Pre-processing removal | Ref |
|---|---|---|---|---|---|---|
Heart rate | Resting Heart Rate | RHR | bpm | Daily resting heart rate value, which is estimated during sleep | Insufficient day- and night-wear-time | [27] |
Physical activity | Step count | SC | steps/day | Total steps taken for the day | Insufficient Day-wear-time | |
Sedentary time | hours/day | Total minutes sedentary time. Minutes asleep are excluded by Fitbit | Insufficient day- and night-wear-time | [5] | ||
Light physical activity | LPA | min/week or min/day | Total minutes of light physical activity in a week | Insufficient day-wear-time | ||
Moderate physical activity | MPA | min/week or min/day | Total minutes of moderate physical activity in a week | Insufficient day-wear-time | ||
Vigorous physical activity | VPA | min/week or min/day | Total minutes of vigorous physical activity in a week | Insufficient day-wear-time | ||
Sleep | Sleep time | hours/day | Total number of minutes the user was asleep across all sleep records in the sleep log | Insufficient night-wear time | ||
Sleep efficiency* | %/day | Sleep time divided by time in bed (sleep time + sleep restless duration).** | Insufficient night-wear time | |||
Self-monitoring behaviour | Weigh-ins* | days/week | Number of smart-scale recorded weigh measurements per week | [15] | ||
Tracker worn* | days/week | Number of valid day-time measurement per week | [15] | |||
Activity registrations* | /week | Number of activities logged per week by the participants on the Fitbit device | [15] |