Baseline, weight change, and engagement characteristics of study starters and completers
| Non-starters (N=77/121) | Starters (N=43) | Completers (N=36) | |
|---|---|---|---|
| Mean±SD | Mean±SD | Mean±SD | |
| Baseline | |||
| Gender, female N (%) | 54 (69.2%)* | 37 (86%) | 30 (83.3%) |
| Mean age (years) | 46.97±9.44† | 51.49±8.30 | 51.44±8.48 |
| Height (m) | 1.68±0.15 | 1.65±0.09 | 1.66±0.09 |
| Weight (kg) | 91.50±18.21 (N=29) | 96.61±22.33 | 96.26±23.08 |
| BMI (kg/m2) | 32.55±6.99 (N=29) | 35.51±7.38 | 34.79±7.33 |
| 16 weeks‡ | |||
| Weight loss (kg) | −5.40±4.43 | −6.00±4.34 | |
| Weight loss (%) | −5.65±4.34 | −6.33±4.22 | |
| BMI change (kg/m2) | −1.99±1.66 | −2.20±1.63 | |
| 24 weeks§ | |||
| Weight loss (kg) | −6.22±5.00 | −7.01±4.83 | |
| Weight loss (%) | −6.58±5.12 | −7.50±4.93 | |
| BMI change (kg/m2) | −2.29±1.87 | −2.57±1.81 | |
| 24 week engagement—in-app actions | |||
| Meals logged (meals per week) | 13.93±6.00 | 15.28±5.13 | |
| Exercise (times/week) | 3.11±2.34 | 3.43±2.34 | |
| Time exercised (minutes/week) | 126.61±110.76 | 141.60±112.88 | |
| Steps recorded (steps/week) | 21116.87±18413.06 | 24045.97±18112.21 | |
| Number of weigh-ins (times/week) | 1.04±0.93 | 1.17±0.96 | |
| Articles read (articles/week) | 5.11±2.67 | 5.86±2.22 | |
| Group posts (posts/week) | 0.51±0.85 | 0.59±0.91 | |
| Group comments (comments/week) | 1.80±1.77 | 2.08±1.79 | |
| Messages to coach (messages/week) | 3.32±2.77 | 3.78±2.75 | |
| Group likes (likes/week) | 1.00±1.71 | 1.11±1.80 | |
Weight change from 16 to 24 weeks was not significant.
*p=0.036 between non-starters and starters.
†p=0.008 between non-starters and starters.
‡All changes from baseline to 16 weeks were significant in starters and completers, p<0.001, d=1.22 and 1.38, respectively.
§All changes from baseline to 24 weeks were significant in starters and completers, p<0.001, d=1.24 and 1.45, respectively.
BMI, body mass index.