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Table 2 Laboratory tests, chest imaging, and nucleic acid testing of suspected cases of COVID-19

From: Differential diagnosis for suspected cases of coronavirus disease 2019: a retrospective study

  Confirmed COVID-19 group
n = 17
COVID-19-negative group
n = 51
P value
White blood cell count, mean (SD), ×109/L 5.27 ± 2.08 6.73 ± 1.94 0.010
  < 4, n (%) 5 (29.4%) 2 (3.9%) 0.003
 4–10, n (%) 12 (70.6%) 47 (92.2%) 0.023
  > 10, n (%) 0 2 (3.9%) NA
Lymphocyte count, mean (SD), ×109/L 1.35 ± 0.83 1.63 ± 0.81 0.224
  < 1.1, n (%) 8 (47.1%) 13 (25.5%) 0.096
  ≥ 1.1, n (%) 9 (52.9%) 38 (74.5%)
Hemoglobin concentration, mean (SD), (g//L) 135.18 ± 17.02 138.66 ± 20.33 0.528
  < 120, n (%) 3 (17.6%) 7 (13.7%) 0.693
  ≥ 120, n (%) 14 (82.4%) 44 (86.3%)
Platelet count, mean (SD), (×109/L) 198.41 ± 92.02 217.52 ± 72.42 0.384
  < 100, n (%) 1 (5.9%) 2 (2.9%) NA
  ≥ 100, n (%) 16 (94.1%) 49 (96.1%)
C-reactive protein, mean (SD), (mg/L) 29.27 ± 31.30 17.25 ± 23.31 0.097
Chest CT, n (%)
 Ground-glass opacities 14 (82.4%) 16 (31.4%) 0.0002
 Consolidation 7 (41.2%) 9 (17.6%) 0.048
 Patchy shadows 13 (76.5%) 22 (43.1%) 0.017
 Grid-like images 3 (17.6%) 2 (3.9%)  
 Bronchial wall thickening 0 5 (9.8) NA
 Reversed halo sign 0 1 (2.0) NA
 Bilateral pulmonary involvement 14 (82.4%) 8 (15.7%) < 0.001
SARS-CoV-2 nucleic acid testing, n (%)
 Positive in the first test 13 (76.5%) 0  
 Positive in the second test 3 (17.6%) 0  
 Weak positive in the first test 1 (5.9%) 0  
 Suspected positive in the first test 1 (5.9%) 1 (2.0%)  
Multiplex PCR, n (%)
 Influenza A 0 2 (3.9%)  
 Influenza B 0 3 (5.9%)  
 Adenovirus 0 2 (3.9%)  
 Chlamydia pneumoniae 0 2 (3.9%)  
Mycoplasma pneumoniae 0 7 (13.7%)  
  1. COVID-19 coronavirus disease 2019, CT computed tomography, NA not applicable, RT-PCR reverse transcriptase polymerase chain reaction, SARS-CoV-2 severe acute respiratory syndrome coronavirus