Table 1.
Prizes awarded at each clinic visit for treatment group 1
| Prize | Value (USD) | Win probability |
|---|---|---|
| No prize | 0 | 0.25 |
| Small water bottle | 0.50 | 0.25 |
| Large water bottle | 1.00 | 0.25 |
| Umbrella or coffee mug | 1.50 | 0.25 |
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