Table 1 Basic characteristics and N-specific antibody results (positive vs. negative).

From: Increased SARS-CoV-2 seroprevalence and spread of infection without awareness among healthcare workers through 2020–2022 in a Japanese medical center

 

Overall (%)a

N-specific antibody positive

n (%)

N-specific antibody negative

n (%)

P value

All

3788 (100.0)

669 (100.0)

3119 (100.0)

 

Age (years)

 20–29

1092 (28.8)

237 (35.4)

855 (27.4)

< 0.001

 30–39

1171 (31.0)

223 (33.3)

948 (30.4)

 40–49

829 (21.9)

147 (22.0)

682 (21.9)

 50–59

436 (11.5)

49 (7.3)

387 (12.4)

 60 or older

260 (6.9)

13 (1.9)

247 (7.9)

Sex

 Male

1409 (37.2)

248 (37.1)

1161 (37.2)

0.965

 Female

2379 (62.8)

421 (62.9)

1958 (62.8)

Profession

 Medical doctors

1497 (39.5)

279 (41.7)

1218 (39.1)

< 0.001

 Nurses

1080 (28.5)

238 (35.6)

842 (27.0)

 Laboratory personnel

182 (4.8)

18 (2.7)

164 (5.3)

 Paramedics

320 (8.4)

33 (4.9)

287 (9.2)

 Administrative staff

542 (14.3)

79 (11.8)

463 (14.8)

 Researchers

157 (4.1)

22 (3.3)

135 (4.3)

 Others

10 (0.3)

0 (0.0)

10 (0.3)

No. of vaccine doses received

 Unvaccinated

80 (2.1)

18 (2.7)

62 (2.0)

< 0.001

 1 dose

14 (0.4)

4 (0.6)

10 (0.3)

 2 doses

300 (7.9)

77 (11.5)

223 (7.1)

 3 doses

3384 (89.3)

570 (85.2)

2814 (90.2)

 4 doses

10 (0.3)

0 (0.0)

10 (0.3)

  1. aNumbers of participants by categories in this table indicate the status at the time of the 2022 health check-up, conducted from June 8 to June 20 in Juntendo University Hospital of Tokyo, Japan. A two-tailed p < 0.05 was considered significant.