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Table 1 Characteristics of HCW participants by survey sample and SARS-CoV-2 seropositivity

From: Longitudinal SARS-CoV-2 seroepidemiological investigation among healthcare workers at a tertiary care hospital in Germany

Variable

May/June 2020

December 2020

Longitudinal sample

All

(N = 1477)

Seropositive

(N = 18)

Seronegative

(N = 1459)

All

(N = 1223)

Seropositive

(N = 56)

Seronegative

(N = 1167)

All

(N = 756)

Age in years, median (IQR)

41 (32–51)

37 (27.8–49.3)

41 (32–51)

40 (32–51)

40 (30–47)

40 (32–51)

43 (34–52)

Age groups in years

       

 16–29

189 (12.8%)

5 (27.8%)

184 (12.6%)

176 (14.4%)

12 (21.4%)

164 (14.0%)

66 (8.7%)

 30–39

503 (34.1%)

4 (22.2%)

499 (34.2%)

405 (33.1%)

15 (26.8%)

390 (33.4%)

246 (32.5%)

 40–49

349 (23.6%)

5 (27.8%)

344 (23.6%)

284 (23.2%)

20 (35.7%)

264 (22.6%)

195 (25.8%)

 50–59

358 (24.2%)

3 (16.7%)

355 (24.3%)

281 (23.0%)

6 (10.7%)

275 (23.5%)

211 (27.9%)

 60+

73 (4.9%)

1 (5.6%)

72 (4.9%)

58 (4.7%)

2 (3.6%)

56 (4.8%)

38 (5.0%)

 Unknown

5 (0.3%)

0

5 (3.4%)

19 (1.6%)

1 (1.8%)

19 (1.6%)

0 (0.0%)

Gender

       

 Female

1038 (70.3%)

12 (66.7%)

1026 (70.3%)

842 (68.8%)

31 (55.4%)

811 (69.5%)

527 (69.7%)

 Male

436 (29.5%)

6 (33.3%)

430 (29.5%)

380 (31.1%)

24 (42.9%)

356 (30.5%)

229 (30.3%)

 Diverse

1 (0.1%)

0

1 (0.1%)

1 (0.1%)

1 (1.8%)

0

0 (0.0%)

 Unknown

2 (0.1%)

0

2 (0.1%)

0 (0.0%)

0

0

0 (0.0%)

Self-reported COVID-19-like symptomsa

       

 Yes

140 (9.5%)

7 (38.9%)

133 (9.1%)

193 (15.8%)

21 (37.5%)

172 (14.7%)

115 (15.2%)

 No

1148 (77.8%)

10 (55.6%)

1138 (78.0%)

1013 (82.8%)

34 (60.7%)

979 (83.9%)

627 (82.9%)

 Unknown

189 (12.8%)

1 (5.6%)

188 (12.9%)

17 (1.4%)

1 (1.8%)

16 (13.7%)

14 (1.9%)

Type of profession

       

 Nurse

469 (31.8%)

6 (33.3%)

463 (31.7%)

326 (26.7%)

22 (39.3%)

305 (26.1%)

189 (25.0%)

 Physician

307 (20.8%)

8 (44.4%)

299 (20.5%)

264 (21.6%)

14 (25.0%)

250 (21.4%)

167 (22.1%)

 Other allied health professionals

298 (20.2%)

2 (11.1%)

296 (20.3%)

276 (22.6%)

10 (17.9%)

266 (22.8%)

178 (23.5%)

 Administration/other facility management

367 (24.8%)

1 (5.6%)

366 (25.1%)

325 (26.6%)

9 (16.1%)

316 (27.1%)

211 (27.9%)

 Unknown

37 (2.5%)

1 (5.6%)

35 (2.4%)

31 (2.5%)

1 (1.8%)

30 (2.6%)

11 (1.5%)

SARS-CoV-2 occupational risk

       

 High

74 (5.0%)

3 (16.7%)

71 (4.9%)

58 (4.7%)

13 (23.2%)

45 (3.9%)

37 (4.9%)

 Moderate

204 (13.8%)

8 (44.4%)

196 (13.4%)

200 (16.4%)

12 (21.4%)

188 (16.1%)

99 (13.1%)

 Low

843 (57.1%)

7 (38.9%)

836 (57.3%)

619 (50.6%)

26 (46.4%)

593 (50.8%)

394 (52.1%)

 Very low

337 (22.8%)

0

337 (23.1%)

332 (27.1%)

5 (8.9%)

327 (28.0%)

218 (28.8%)

Unknown

19 (1.3%)

0

19 (1.3%)

14 (1.1%)

0

14 (1.2%)

8 (1.1%)

  1. IQR interquartile range
  2. aIn May/June, HCWs reported symptoms in the past month; In December, HCWs reported symptoms in the last 14 days
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