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Table. 1 Descriptive data of the KoCo-19 follow-up participants in comparison to participants only taking part in the baseline study (“Losses to follow-up”)

From: From first to second wave: follow-up of the prospective COVID-19 cohort (KoCo19) in Munich (Germany)

Variable Categories* N nMissing Losses to follow-up (N = 880) Follow-up participants (N = 4433)  p#
     n % n %  
  Total 5313 0 880 16.6 4433 83.4  
Sex Female 2766 0 446 50.7 2320 52.3 0.38
Age 0–19 267 0 55 6.3 211 4.8  < 0.001
(years) 20–34 1346   306 34.8 1040 23.5  
  35–49 1542   271 30.8 1271 28.7  
  50–64 1306   140 15.9 1166 26.3  
  65–79 676   77 8.8 599 13.5  
  80+  176   31 3.5 145 3.3  
Birth country Germany 3999 465 478 73.9 3521 83.8  < 0.001
Level of education Student 100 701 20 3.2 80 2.0 0.01
   < 12 years 1386   211 33.8 1175 29.5  
   ≥ 12 years 3126   394 63.0 2732 68.5  
Occupationally active Yes 3935 470 522 80.8 3413 81.3 0.75
Smoking status Never smoker 2540 487 323 50.0 2217 53.0 0.007
  Ex-smoker 1411   177 27.4 1234 29.5  
  Current smoker 875   146 22.6 729 17.5  
General health Excellent 798 466 112 17.3 686 16.4 0.20
  Very good 2126   274 42.3 1852 44.1  
  Good 1717   224 34.6 1493 35.5  
  Not good 206   37 5.7 169 4.0  
Respiratory allergies Yes 1379 540 187 29.2 1192 28.8 0.85
Diabetes Yes 208 504 41 6.4 167 4.0 0.009
CVD Yes 892 513 91 14.2 801 19.3 0.002
Obesity Yes 279 521 31 4.9 248 6.0 0.28
Household type Single 680 494 92 14.4 588 14.1  < 0.001
  Couple 1705   174 27.2 1531 36.6  
  Family 1953   279 43.6 1674 40.1  
  Others 481   95 14.8 386 9.2  
Household income  ≤ 2500 593 1636 92 20.3 501 15.5 0.02
(Euro) 2501–4000 817   111 24.4 706 21.9  
  4001–6000 1176   133 29.3 1043 32.4  
  6000 +  1091   118 26.0 973 30.2  
Living area/inhabitant  ≤ 30 1702 513 270 42.5 1432 34.4  < 0.001
(sqm/individual) 31–40 1213   175 27.5 1038 24.9  
  41–55 988   99 15.6 889 21.3  
  55 +  897   92 14.5 805 19.3  
Building type 1–2 1433 0 170 19.3 1263 28.5  < 0.001
(No of apartments) 3–4 354   47 5.3 307 6.9  
  5 +  3519   663 75.3 2856 64.4  
  Others 7   0 0.0 7 0.2  
Baselinesero-prevalence Positive 93   23 2.6 70 1.6 0.047
  1. *For category definitions please see the methods section of the article
  2. #p-values were obtained by Chi Square Test using 10,000 replicates for variables with more than 2 categories. For variables with only 2 categories, p-values were obtained by Fisher Exact Test