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Table 1 Mean and median of SARS-CoV-2 anti-NP (COI) and anti-S (ratio) after 15, 25, and 35 days after onset of symptoms of COVID-19 among 92 home-isolated patients, Alexandria, Egypt

From: Delayed seropositivity is associated with lower levels of SARS-CoV-2 antibody levels in patients with mild to moderate COVID-19

 

Antibody level

p value

Days after onset of COVID-19 symptoms

COI of anti-NP

Ratio of anti-S

15 days

 Mean ± SD

11.73 ± 20.01

8.8 ± 18.9

 

 Median (min–max)

4.3 (0.08–140)

3.39 (0.24–122)

0.01* b

25 days

 Mean ± SD

4.1 ± 4.9

1.9 ± 1.15

0.23 b

 Median (min–max)

2.23 (0.11–17.6)

1.9 (0.5–4.5)

 

35 days

 Mean ± SD

2.61 ± 2.94

0.83 ± .32

 

 Median (min–max)

1.54 (0.10–8.15)

0.89 (0.45–1.11)

0.31 b

P value

0.03* a

0.05 a

 
  1. a*P < 0.05 (significant) using Friedman test
  2. b*P < 0.05 (significant) using Wilcoxon signed rank test