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Table 4 Response rates and analysis cases by calendar week

From: Development of a new COVID-19 panel survey: the IAB high-frequency online personal panel (HOPP)

Wave Month Calendar week New recruits Wave 1 Panellists Refreshment Panellists Number of analysis cases
Ninvited RR Ninvited RR Ninvited RR Overall With record linkage consent
1 May 19 200,000 3.9 7.702 6.484
2 June 23 2435 39.7 966 872
24 2436 36.5 888 811
25 2444 33.8 826 744
26 2441 32.5 794 726
3 July 27 2435 31.2 760 698
28 2436 31.0 754 684
29 2444 27.5 671 602
30 2441 29.1 710 647
4 August 31 2435 23.4 570 517
32 2436 22.3 543 490
33 2444 21.7 530 480
34 2441 20.8 507 466
5 September 36 24,797 4.6 938 46.5 1575 1355
38 24,797 4.4 928 35.2 1409 1232
October 40 24,797 4.5 926 52.6 1615 1405
42 24,797 4.8 966 56.6 1728 1504
6 Novembera 45 935 62.2 1171 48.1 1145 1064
47 925 62.3 1224 48.5 1170 1093
December 49 921 59.6 1308 49.1 1191 1085
51 963 67.6 1235 54.9 1329 1216
7 January 2 933 64.1 1170 50.1 1184 1092
4 919 67.2 1218 47.7 1199 1133
February 6 919 61.0 1311 47.7 1187 1083
8 960 62.7 1235 46.3 1174 1078
  1. aTime of invitation changed from Friday to Monday.