Three-month follow-up after severe COVID-19 infection: are chest CT results associated with respiratory outcomes and respiratory recovery in COVID-19 patients?

Table 4 CT-severity score at three months and oxygen suppletion during hospitalization

	Range CT-SS (minimum-maximum)	Mean CT-SS Mean (SD)	P-value *
WHO score baseline†			P = 0.194
- 4: hospitalisation, requiring oxygen (N = 90)	2.5–20.0	8.3 (4.0)
- 5: hospitalisation, requiring high-flow nasal oxygen therapy or non-invasive ventilation (N = 14)	3.5–18.5	10.4 (5.0)
- 6: hospitalisation, requiring ECMO, invasive mechanical ventilation or both (N = 9)	4.0–12.5	9.4 (2.9)
Maximum oxygen suppletion during the whole hospitalization			P = 0.007
- Nasal oxygen (N = 44)	2.5–14.5	7.1 (3.2)
- Oxymask/NRM (N = 23)	3.5–19.0	8.8 (4.7)
- High flow nasal cannula (N = 19)	3.5–20.0	9.2 (4.6)
- Mechanical ventilation (N = 27)	3.5–18.5	10.6 (4.0)

†WHO score: The WHO score consists of 7 stages which are: (1) non-hospitalized, able to resume normal activities; (2) non-hospitalized, but unable to resume normal activities; (3) hospitalized, not requiring oxygen therapy; (4) hospitalized, requiring additional oxygen therapy; (5) hospitalized, requiring high-flow nasal oxygen therapy, non-invasive mechanical ventilation or both; (6) hospitalized, requiring extracorporeal membrane oxygenation, mechanical ventilation or both; and (7) death. The scale was used from 2 to 7 for this study
†Baseline is at the day on which patients fulfilled the criteria for hyperinflammation during hospitalisation
*Calculated with one-way ANOVA or Kruskal Wallis, as appropriate
CT-SS, CT severity score; WHO, World Health Organisation; ECMO, extracorporeal membrane oxygenation; NRM, non-rebreathing mask

ISSN: 1471-2466