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Table 2 The CT changes, CT pattern, CT severity score, complications, and oxygen saturation that occurred during different stage of the COVID-19 course

From: Longitudinal assessment of chest computerized tomography and oxygen saturation for patients with COVID-19

Findings 1st stage (CT 0-3 days) 2nd stage (CT 4-7 days) 3rd stage (CT 8-14 days) 4th stage (CT 15-21 days) P value
Number of the patients 82 67 71 73  
GGO 52 (63.4%) a 59 (88.1%) b 60 (84.5%) b 57 (78.1%) ab #0.001*
Crazy paving 15 (18.3%) ab 21 (31.3%) ab 23 (32.4%) a 10 (13.7%) b #0.014*
Consolidation 14 (17.1%) a 27 (40.3%) b 45 (63.4%) c 13 (17.8%) a # < 0.001*
Fibrosis 0 (0.0%) a 8 (11.9%) b 24 (33.8%) c 32 (43.8%) c # < 0.001*
CT Pattern
Pure GGO 39 (47.6%) abc 34 (50.7%) c 20 (28.2%) b 46 (63.0%) ac § < 0.001*
Consolidation 1 (1.2%) a 1 (1.5%) a 5 (7.0%) a 2 (2.7%) a
Mixed 13 (15.9%) a 25 (37.3%) b 40 (56.3%) b 11 (15.1%) a
Negative 29 (35.4%) a 7 (10.4%) b 6 (8.5%) b 14 (19.2%) ab
Mixed pattern
Predominant GGO 6 (46.2%) 13 (52.0%) 9 (22.5%) 5 (45.5%) §0.069
Predominant Consolidation 7 (53.8%) 12 (48.0%) 31 (77.5%) 6 (54.5%)
Complications 3 (3.7%) a 3 (4.5%) a 19 (27.1%) b 3 (4.1%) a # < 0.001*
Types of complications
Hypoxia 3 (3.7%) ab 3 (4.5%) ab 11 (15.7%) a 1 (1.4%) b §0.004*
Pl. effusion 0 (0.0%) a 0 (0.0%) a 13 (18.6%) b 2 (2.7%) a § < 0.001*
Resp. distress 0 (0.0%) 0 (0.0%) 2 (2.9%) 0 (0.0%) §0.105
Pneumothorax 0 (0.0%) 0 (0.0%) 1 (1.4%) 0 (0.0%) §0.469
Number of the lobes affected 2.0 ± 1.9 a 3.3 ± 1.7 bc 3.8 ± 1.6 c 2.7 ± 1.8 ab ^< 0.001*
CT severity score 2.4 ± 3.0 a 5.2 ± 3.8 b 7.1 ± 5.1 c 3.7±3.5 ab ^< 0.001*
Oxygen saturation SpO2 % 96.8 ± 2.2 a 96.3 ± 2.0 a 93.9 ± 3.7 b 96.6±1.9 a ^< 0.001*
  1. Post hoc Bonferroni test (homogenous groups had the same symbol “a, b, c”)
  2. ^ANOVA test
  3. #Chi square test
  4. §Fisher’s exact test
  5. *Significant