Table 9 Field Dates
From: Teaching evolution in U.S. public middle schools: results of the first national survey
| Main pencil/paper study | |
| February 15, 2019: | 5015 pre-notification letters sent |
| February 22, 2019: | 5015 survey packets with consent and pre-incentive |
| March 1, 2019: | 5015 reminder postcards sent |
| March 18, 2019: | 4540 replacement packets sent |
| March 25, 2019: | 4132 reminder postcards sent |
| May 24, 2019: | Mail survey data collection closed |
| Qualtrics follow-up | |
| Main follow-up file (emails provided by MDR) | |
| April 17, 2019: | 3161 emails sent |
| April 23, 2019: | 2026 emails sent |
| April 29, 2019: | 2883 emails sent |
| May 2, 2019: | Last recorded survey |
| May 11, 2019: | Survey closed |
| Supplemental follow-up file (emails identified in audit) | |
| April 23, 2019: | 352 emails sent |
| April 25, 2019: | 335 emails sent |
| May 1, 2019: | 314 emails sent |
| May 2, 2019: | Last recorded survey |
| May 11, 2019: | Survey closed |