Table 5.
Intention-to-Treat Regression coefficients* for the association between incentive and the outcomes at end of intervention (score at week 16 minus score at baseline [week 0]) (N=99) NIG was the reference.
| Outcome measure | Collective IG | p-value | Standard Plus Deposit IG | p-value | Standard IG | p-value |
|---|---|---|---|---|---|---|
| Weight related outcomes | ||||||
| Change in weight (pounds) | −5.63 (−9.44, −1.81) |
0.018 | −7.01 (−10.16, 3.88) |
0.006 | −4.65 (−8.35, −0.96) |
0.028 |
| Odds ratio of achieving weight loss goals | 3.07 (0.74, 12.69) |
0.122 | 3.84 (1.02, 19.78) |
0.060 | 4.26 (0.94, 15.59) |
0.224 |
| Change in BMI (kg/m2) | −0.94 (−1.47, −0.41) |
0.011 | −1.37 (−2.96, −0.23) |
0.072 | −0.64 (−1.33, 0.05) |
0.060 |
| Change in waist-hip ratio | −0.005 (−0.03, 0.02) |
0.609 | −0.020 (−0.06, 0.02) |
0.215 | 0.005 (−0.02, 0.03) |
0.590 |
| Diabetes risk factors | ||||||
| Change in DRS | −0.68 (−0.97, −0.39) |
0.005 | −1.64 (−2.54, −0.74) |
0.010 | −0.01 (−0.28, 0.27) |
0.929 |
| Change in probability of being physically active (at least 30 minutes in most days) |
0.05 (−0.03, 0.13) |
0.102 | 0.20 (−0.13, 0.53) |
0.146 | −0.05 (−0.16, 0.06) |
0.257 |
| Change in probability of healthy eating (eating vegetable and fruits every day) |
0.21 (0.09, 0.34) |
0.011 | 0.33 (0.06, 0.61) |
0.030 | 0.13 (−0.07, 0.62) |
0.340 |
| Cardiovascular risk factors | ||||||
| Change in Systolic BP | 1.75 (−5.15, 8.65) |
0.479 | 2.38 (−9.90, 14.65) |
0.582 | 1.31 (−2.51, 5.13) |
0.356 |
| Change in Diastolic BP | 0.94 (−4.71, 6.58) |
0.635 | 0.09 (−9.09, 9.23) |
0.978 | 1.53 (−2.40, 5.46) |
0.304 |
BMI body mass index; BP blood pressure; DRS diabetes risk score; IG incentive group; NIG non-incentive group
*
Each row shows the regression coefficients from a regression model using the outcome measure shown on the same row; the numbers in the parentheses were 95% of confidence intervals of the regression coefficients