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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