Table 4.
Regression results (N=383,719 observations of 54,917 individuals, with 95% CIs in parentheses).
| Dependent variable=probability of quiz acceptance | Estimated coefficients (95% CI) |
| Point change since previous quiz | 1.100 (1.065-1.137) |
| First delay in quizzes | 0.361 (0.345-0.378) |
| Gender (1=male) | 0.845 (0.804-0.887) |
| Age | 0.999 (0.998-1.001) |
| Eating knowledge quiza | 0.896 (0.861-0.932) |
| Exercise knowledge quiza | 1.206 (1.156-1.257) |
| Movie rewards programb | 3.552 (3.176-3.971) |
| Airline rewards programb | 2.096 (1.840-2.386) |
| Grocery rewards programb | 1.402 (1.247-1.575) |
| Completed previous study | 71.891 (67.261-76.839) |
| Model fit—McFadden pseudo-R2 | 0.172 |
aKnowledge quiz estimates relative to health risk assessments.
bRewards program estimates relative to the gasoline rewards program.