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Marginal effect on the probability of screening of an extra $100 per week by level of weekly income and age group
| Group (average $/wk) | $100/wk | $200/wk | $300/wk | $400/wk |
| All ($326) | 6.9% | 4.5% | 2.6% | 0.9% |
| Low 40–49 ($456) | 9.1% | 8.2% | 6.0% | 3.1% |
| High ($279) | 8.9% | 4.9% | 1.7% | -1.0% |
| Low 70–79 ($211) | 33.4% | 14.4% | -8.1% | -30.4% |
