Invitation letter by FedEx envelope (wave 1) | Follow-up postcard 1 (wave 2) | Follow-up postcard 2 (wave 3) | Email1 | |
---|---|---|---|---|
Batch 1 | ||||
Group 1 (N = 495) | 2/8/2021 | 2/12/2021 | 2/26/2021 | 3/26/20211 |
Group 2 (N = 495) | 2/15/2021 | 2/19/2021 | 3/5/2021 | |
Group 3 (N = 495) | 2/22/2021 | 2/26/2021 | 3/12/2021 | |
Group 4 (N = 522) | 3/1/2021 | 3/5/2021 | 3/19/2021 | |
Group 5 (N = 132) | 3/15/2021 | 3/19/2021 | 4/2/2021 | |
Batch 2 | ||||
Group 6 (N = 709) | 4/19/2021 | 4/27/2021 | 5/7/2021 | 5/21/20211 |
Group 7 (N = 709) | 4/26/2021 | 4/30/2021 | 5/14/2021 | |
Group 8 (N = 709) | 5/3/2021 | 5/7/2021 | 5/21/2021 | |
Group 9 (N = 722) | 5/10/2021 | 5/14/2021 | 5/28/2021 |