Table 1 Characteristics of participants with any N-antibody measurement (N = 270,686)

From: Identification of undetected SARS-CoV-2 infections by clustering of Nucleocapsid antibody trajectories

N = 270,686

Number of N-antibody measurements (median [IQR])

6 [3, 8]

Age at last birthday (years) (median [IQR], percentiles [1, 99])

55 [41, 67], [15,85]

Sex (%)

Female

146,823 (54.2)

 

Male

123,863 (45.8)

Ethnicity (%)

Non-White

16,291 (6.0)

 

White

254,395 (94.0)

Long-term health condition (%)

No

199,636 (73.8)

 

Yes

71,050 (26.2)

Healthcare worker (%)

No

257,115 (95.0)

 

Yes

13,571 (5.0)

Vaccination*

Not vaccinated

15,392 (5.7)

 

1 vaccination

19,795 (7.3)

 

2 vaccinations

76,830 (28.4)

 

3 vaccinations

158,338 (58.5)

 

4 vaccinations

216 (0.1)

 

Missing

115 (0.0)

Swab-positive infections (%)

No infection

219,663 (81.2)

 

Infection before the study period

22,920 (8.5)

 

Infection during the study period***

26,836 (9.9)

 

Infection before and during the study period‡***

1267 (0.5)

Spike-antibody seropositivity**

No spike seropositivity

262,513 (97.0)

 

Spike seropositive before the study period

7446 (2.8)

 

Spike seropositive during the study period

727 (0.3)

  1. *Vaccination status at the end of each participant’s study period.
  2. † As identified from swab test results (see “Methods”).
  3. ** Before any reported vaccinations.
  4. ‡ 314 participants had two or more swab-positive infections before their study period
  5. *** 363 participants had two or more swab-positive infections during their study period
  6. IQR Inter quartile range.
  7. Note: study period defined as the time from each participant’s first N-antibody measurement to their last N-antibody measurement. Participants could be in the survey before this started, see “Methods”.