Table 2.
Weight Losses
| Variable | All randomized participantsa | Completers | ||||||
|---|---|---|---|---|---|---|---|---|
|
| ||||||||
| Internet-only | Internet + incentives | Group difference (95% CI) | t (24) | Internet-only | Internet + incentives | Group difference (95% CI) | t (24) | |
| 2-month data collection | ||||||||
| n (%) | 212 (100) | 206 (100) | 194 (92) | 195 (95) | ||||
| Weight loss, kg, M±SD | 3.1 ± 3.4 | 4.3 ± 3.0 | 1.2 (0.5, 1.9) | 3.55 *** | 3.2 ± 3.4 | 4.3 ± 3.0 | 1.2 (0.6, 1.9) | 3.78 *** |
| Weight loss, %, M±SD | 3.2 ± 3.1 | 4.5 ± 3.1 | 1.2 (0.6, 2.0) | 3.61 *** | 3.3 ± 3.1 | 4.5 ± 3.0 | 1.3 (0.6, 1.6) | 3.95 *** |
| ≥3% weight loss, n (%) | 105 (50) | 132 (64) | 15 (5, 23) | 2.99 ** | 105 (54) | 132 (68) | 14 (4, 22) | 2.73 * |
| ≥5% weight loss, n (%) | 46 (22) | 86 (42) | 20 (8, 33) | 3.58 ** | 46 (24) | 86 (44) | 21 (8, 34) | 3.57 *** |
| 6-month data collection | ||||||||
| n (%) | 212 (100) | 206 (100) | 172 (81) | 188 (91) | ||||
| Weight loss, kg, M±SD | 4.7 ± 6.6 | 6.4 ± 5.5 | 2.1 (0.4, 3.8) | 2.66 ** | 5.2 ± 6.5 | 6.7 ± 5.4 | 1.7 (0.4, 3.0) | 2.63 * |
| Weight loss, %, M±SD | 4.9 ± 6.4 | 6.8 ± 5.7 | 2.0 (0, 4) | 2.51 * | 5.4 ± 6.1 | 7.1 ± 5.5 | 1.8 (0.4, 3.2) | 2.55 * |
| ≥5% weight loss, n (%) | 85 (40) | 114 (55) | 15 (4, 26) | 2.72 * | 85 (49) | 114 (61) | 11 (0, 21) | 2.00 |
| ≥10% weight loss, n (%) | 34 (16) | 58 (28) | 12 (2, 26) | 2.41 * | 34 (20) | 58 (31) | 11 (0, 25) | 2.04 |
Note: Boldface indicates statistical significance
*
p<0.05
**
p<0.01
***
p<0.001
a
Multiple imputation used to generate missing data for intent-to-treat analyses.