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Table 1 Comparisons between patients with positive and negative IgG antibody

From: Detection of IgG antibody during the follow-up in patients with COVID-19 infection

Variables Positive IgG (n = 397) Negative IgG (n = 87) Negative IgG (≥ 2 tests) (n = 37) p
Age (years) 51.2 ± 13.9 49.6 ± 17.2 51.8 ± 19.4 0.365
Gender (male, %) 190 (47.8) 43 (49.4) 13 (35.1) 0.791
White blood cell count on admission 5.3 ± 1.8 7.1 ± 3.1 6.9 ± 2.7 < 0.001
Lymphocyte count on admission 1.3 ± 0.0 1.6 ± 0.1 1.6 ± 0.7 0.001
Neutrophil count on admission 3.5 ± 1.6 5.0 ± 3.0 4.7 ± 2.5 < 0.001
White blood cell count at follow-up 6.3 ± 1.7 6.5 ± 1.8 6.2 ± 1.8 0.387
Lymphocyte count at follow-up 2.1 ± 0.6 2.1 ± 0.6 2.0 ± 0.7 0.738
Neutrophil count at follow-up 3.7 ± 1.4 3.9 ± 1.4 3.6 ± 1.3 0.296
Maximum duration of IgG test 50.5 ± 14.8 43.3 ± 15.0 50.6 ± 12.1 < 0.001
Maximum duration of IgG test*, median (min and max value) 51 (10–100) 42 (2–90) 50 (28–90) < 0.001
Abnormal CT findings at follow-up# (which indicate residual infection) 259/372 22/64 10/32 < 0.001
  1. All comparisons were made between positive IgG and negative IgG groups
  2. IgG immunoglobulin G, CT computed tomography
  3. *Presented as median (minimum and maximum value), compared using rank-sum test
  4. #Any chest CT findings that suggested residual infection during follow-up were defined as abnormal