Table 4.
Determinants of reductions in body mass index, at 10 and 23 weeks versus baseline, combined in models using linear mixed models.
| Characteristics of program usage: models | ∆ BMIa,b, kg/m2 | |||||
| Sources of variance, SD (95% CI) | Β (95% CI) | |||||
| Model: description | Independent variables (additional) |
Categories | Between teams | Between participants |
|
|
| Model 1: raw |
|
|
N/Ac | 1.38 (0.97 to 1.96) | N/A | |
| Model 2: baseline characteristics |
|
|
N/A | N/A |
|
|
|
|
Age |
|
|
|
−0.001 (−0.06 to 0.06) | |
|
|
Sex | Women |
|
|
Reference | |
|
|
|
Men |
|
|
−0.28 (−1.61 to 1.04) | |
|
|
BMI at baseline |
|
|
|
0.11 (0.01 to 0.21)h | |
| Model 3: model 2 + eHealth team |
|
|
0.53 (0.10 to 2.73) | 1.36 (0.95 to 1.94) |
|
|
| Model 4: model 3 + compliance |
|
|
0.39 (0.001 to 0.59) | 1.08 (0.65 to 1.78) |
|
|
|
|
Complianced | <85% |
|
|
Reference | |
|
|
|
85%-95% |
|
|
-0.14 (-1.41 to 1.13) | |
|
|
|
≥95% |
|
|
0.60 (-0.57 to 1.77) | |
| Model 5: model 3 + engagement |
|
|
0.43 (0.001 to 0.60) | 1.26 (0.86 to 1.84) |
|
|
|
|
Engagemente | ≤3 |
|
|
Reference | |
|
|
|
4 or 5 |
|
|
1.23 (0.17 to 2.29) | |
| Model 6: model 3 + MVPAf |
|
|
0.44 (0.001 to 0.60) | 1.06 (0.65 to 1.74) |
|
|
|
|
MVPA |
|
|
|
0.16 (−0.39 to 0.70) | |
| Model 7: model 3 + compliance + engagement + MVPA |
|
|
0.50 (−0.00 to 0.64) | 1.04 (0.62 to 1.75) |
|
|
|
|
Compliance | <85% |
|
|
Reference | |
|
|
|
85%-95% |
|
|
−0.09 (−1.37 to 1.19) | |
|
|
|
≥95% |
|
|
0.13 (−1.22 to 1.47) | |
|
|
Engagement | ≤3 |
|
|
Reference | |
|
|
|
4 or 5 |
|
|
1.01 (−0.13 to 2.15) | |
|
|
MVPA |
|
|
|
−0.05 (−0.64 to 0.55) | |
|
|
Time | 0-10 weeks |
|
|
Reference | |
|
|
|
0-23 weeks |
|
|
0.99 (0.35 to 1.62)g | |
aBMI: body mass index.
b∆ of outcome = reduction in outcome calculated by measurement at baseline minus measurement at follow-up.
cN/A: not applicable.
dCompliance is expressed as percentage of days with >10 hours of physical activity registration (accelerometer wear).
eEngagement is expressed as the number of times at least 100% of the target was reached (1-5).
fMVPA: moderate to vigorous physical activity.
gStatistically significant at P<.05.