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Table 3 Imaging at arrival in the ED of RT-PCR negative patients. Data are described in the whole group and in the two subgroups COVID-19 and NOT-COVID defined at the end of the hospital stay by clinical judgment or further testing. Data are expressed as absolute frequencies and percentages (in brackets) for categorical variables and as medians and Interquartile Ranges [IQR]

From: The broad spectrum of COVID-like patients initially negative at RT-PCR testing: a cohort study

  Overall N (%) COVID-19 N (%) COVID-free/other than COVID N (%) p
Chest X ray (n = 107)     0.525°
Pneumonia consolidation 24 (22.4) 15 (24.6) 9 (19.6)  
Interstitial syndrome 29 (27.1) 19 (31.1) 10 (21.7)  
Aspecific findings 30 (28.0) 15 (24.6) 15 (32.6)  
Normal CXR 24 (22.4) 12 (19.7) 12 (26.1)  
Lung ultrasound (n = 88)     0.019°
Consolidation 18 (20.5) 13 (23.6) 5 (15.2)  
Monolateral mild interstitial syndrome 11 (12.5) 5 (9.1) 6 (18.2)  
Bilateral severe interstitial syndrome 33 (37.5) 26 (47.3) 7 (21.2)  
Pleural effusion 13 (14.8) 7 (12.7) 6 (18.2)  
Normal Lung Ultrasound 13 (14.8) 4 (7.3) 9 (27.3)  
CT scan (n = 85)     < 0.001§
Typical pattern 37 (43.5) 29 (58.0) 8 (22.9)  
Atypical pattern 19 (22.4) 5 (10.0) 14 (40.0)  
Undetermined 27 (31.8) 16 (32.0) 11 (31.4)  
Normal CT scan 2 (2.4) 0 (0.0) 2 (5.7)  
Irregular pleural line (n = 89)     0.043§
No 82 (92.1) 49 (87.5) 33 (100.0)  
Yes 7 (7.9) 7 (12.5) 0 (0.0)  
  1. Comparisons are made with: °Chi-Square test; §Fisher’s Exact test