Table 2.
Response rate by recruitment method across all sites.
| Contact method | Cohort, n | Responders, n (%) |
| 34,934 | 2051 (5.55) | |
| USPS | 14,336 | 460 (3.11) |
| Portal | 4999 | 728 (12.71) |
| Total | 54,269 | 3239 (5.63) |
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