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Table 3 CXRs severity score at different stages

From: Chest X-ray findings monitoring COVID-19 disease course and severity

Severity score Initial X-ray (n = 350) 1st follow-up X-ray (1–4 days) (n = 274) 2nd follow-up X-ray (5–9) (n = 166) 3rd follow-up X-ray (10–15) (n = 140) 4th follow-up X-ray (> 15 days) (n = 135)
No. (%) No. (%) No. (%) No. (%) No. (%)
0 130 (37.1) 40 (14.6) 29 (17.5) 39 (27.9) 53 (39.3)
1 65 (18.6) 49 (17.9) 17 (10.2) 13 (9.3) 21 (15.6)
2 92 (26.3) 76 (27.7) 28 (16.9) 27 (19.3) 26 (19.3)
3 31 (8.9) 44 (16.1) 23 (13.9) 14 (10.0) 9 (6.7)
4 20 (5.7) 28 (10.2) 15 (9.0) 20 (14.3) 12 (8.9)
5 7 (2.0) 15 (5.5) 20 (12.0) 8 (5.7) 2 (1.5)
6 4 (1.1) 18 (6.6) 16 (9.6) 9 (6.4) 9 (6.7)
7 1 (0.3) 4 (11.5) 17 (10.2) 8 (5.7) 3 (2.2)
8 - - 1 (0.6) 2 (1.4) -
Mean ± SD 1.49 ± 1.53 2.08 ± 1.83 3.42 ± 2.32 3.60 ± 2.23 4.51 ± 1.61