Table 3.
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=50) 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) | −5.05 (−1.08, −9.02) |
0.027 | −4.45 (−10.24, 1.33) |
0.092 | −5.92 (−12.6, 0.78) |
0.067 |
| Odds ratio of achieving weight loss goals | 3.07 (0.74, 12.69) |
0.122 | 4.50 (1.02, 19.78) |
0.046 | 4.26 (0.94, 19.35) |
0.060 |
| Change in BMI (kg/m2) | −1.73 (−3.35, −0.10) |
0.043 | −1.62 (−3.12, −0.11) |
0.042 | −1.89 (−3.82, 0.04) |
0.052 |
| Change in waist-hip ratio | −0.007 (−0.06, 0.04) |
0.69 | −0.014 (−0.093, 0.065) |
0.608 | 0.0035 (−0.064, 0.072) |
0.879 |
| Diabetes risk factors | ||||||
| Change in DRS | −1.26 (−1.97, −0.55) |
0.011 | −2.05 (−2.60, −1.50) |
0.001 | −0.10 (−0.81, 0.60) |
0.674 |
| Change in probability of being physically active (at least 30 minutes in most days) |
0.08 (−0.10, 0.25) |
0.248 | 0.21 (−0.04, 0.46) |
0.076 | −0.10 (−0.29, 0.09) |
0.190 |
| Change in probability of healthy eating (eating vegetable and fruits every day) |
0.42 (0.17, 0.68) |
0.013 | 0.47 (0.20, 0.73) |
0.011 | 0.36 (0.11, 0.62) |
0.020 |
| Cardiovascular risk factors | ||||||
| Change in Systolic BP | 3.6 (−9.88, 17.09) |
0.458 | 4.27 (−14.65, 23.19) |
0.524 | 2.69 (−5.61, 10.99) |
0.378 |
| Change in Diastolic BP | 1.78 (−8.56, 12.11) |
0.622 | −0.18 (−13.87, 13.51) |
0.970 | 4.45 (−0.44, 9.34) |
0.063 |
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