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Table 1 Sample characteristics overall and per recruitment wave

From: Tracking social contact networks with online respondent-driven detection: who recruits whom?

   Wave 0 Wave 1 Wave 2 Waves 3–6 Total
(n: 1105) (n: 310) (n: 93) (n: 52) (n: 1560)
   n % n % n % n % n %
Country Netherlands 1018 92.1 295 95.2 86 92.5 52 100 1451 93.0
  Belgium 87 7.9 15a 4.8 7 7.5 0 0 109 7.0
Sex Male 387 35.0 122 39.4 31 33.3 10 19.2 550 35.3
  Female 718 65.0 188 60.6 62 66.7 42 80.8 1010 64.7
Ageb 0–39 139 12.5 91 29.3 26 28.0 13 25.0 268 17.2
  40–49 189 17.1 43 13.9 18 19.3 6 11.5 256 16.4
  50–64 496 44.9 106 34.2 32 34.4 22 42.3 656 42.1
  65+ 281 25.5 70 22.6 17 18.3 11 21.2 379 24.3
Education Bachelor or higher 651 58.9 166 53.5 56 60.2 23 44.2 896 57.4
  Lower than bachelor 144 41.1 29 46.5 37 39.8 29 55.8 664 42.6
Householdc 1-person 280 25.3 78 25.2 22 23.7 10 19.2 390 25.0
  2-persons 478 43.3 110 35.5 38 40.9 22 42.3 648 41.5
  3-persons 145 13.1 35 11.3 6 6.4 6 11.5 192 12.3
  4 or more persons 202 18.3 87 28.0 27 29.0 14 26.9 330 21.2
Work or Study Yes 775 70.1 228 73.5 73 78.5 41 78.8 1117 71.6
  No 330 29.9 82 26.5 20 21.5 11 21.2 443 28.4
Vaccinatedd Yes 516 46.7 104 33.5 19 20.4 15 28.8 654 41.9
  No 589 53.3 206 66.5 74 79.6 37 71.2 906 58.1
Symptoms Yes 506 45.8 172 55.5 56 60.2 35 68.3 769 49.3
  No 599 54.2 138 44.5 37 39.8 17 32.7 791 50.7
Self-reported common cold Yes 175 15.8 60 19.4 27 29.0 10 19.2 272 17.4
  No 930 84.2 250 80.6 66 71.0 42 80.8 1288 82.6
Self-reported influenza Yes 96 8.7 24 7.7 7 7.5 3 5.8 130 8.3
  No 1009 91.3 286 92.3 86 92.5 49 94.2 1430 91.7
ILI Yes 34 3.1 2 0.6 2 2.2 2 3.8 40 2.6
  No 1071 96.9 308 99.4 91 97.8 50 96.2 1520 97.4
  1. aOne participant lived in Germany
  2. bOne participant provided an invalid age
  3. cNote: 48 participants who completed the survey did not provide information on their household size and were assumed to live alone
  4. dVaccinated against influenza in the past 12 months