Table 5. Univariate linear regression models of the impact of duration of hospitalization and severity on quantitative CT-based airway dimension in patients with COVID-19 at the convalescent stage.
| Variables | β | 95% CI | P value | |
|---|---|---|---|---|
| Lower limit | Upper limit | |||
| Duration of hospitalization | ||||
| 1st gen. WA (%)† | −0.0010 | −0.0017 | −0.0003 | 0.004 |
| 2nd gen. WA (%)† | −0.0013 | −0.0020 | −0.0006 | 0.001 |
| 3rd gen. WA (%)† | −0.0016 | −0.0025 | −0.0007 | 0.001 |
| 4th gen. WA (%)† | −0.0012 | −0.0018 | −0.0006 | 0.000 |
| 5th gen. WA (%)† | −0.0010 | −0.0015 | −0.0005 | 0.000 |
| 6th gen. WA (%)† | −0.0008 | −0.0013 | −0.0004 | 0.000 |
| 7th gen. WA (%)† | −0.0005 | −0.0012 | 0.0002 | 0.133 |
| 8th gen. WA (%)‡ | −0.0005 | −0.0010 | 0.0001 | 0.110 |
| Pi10 (mm)† | 0.0006 | −0.0028 | 0.0041 | 0.717 |
| Severity | ||||
| 1st gen. WA (%)§ | −0.0121 | −0.0241 | −0.0001 | 0.049 |
| 2nd gen. WA (%)§ | −0.0107 | −0.0241 | 0.0028 | 0.118 |
| 3rd gen. WA (%)§ | −0.0175 | −0.0344 | −0.0006 | 0.043 |
| 4th gen. WA (%)§ | −0.0151 | −0.0272 | −0.0029 | 0.016 |
| 5th gen. WA (%)§ | −0.0076 | −0.0171 | 0.0020 | 0.119 |
| 6th gen. WA (%)§ | −0.0063 | −0.0148 | 0.0021 | 0.140 |
| 7th gen. WA (%)§ | 0.0016 | −0.0105 | 0.0136 | 0.796 |
| 8th gen. WA (%)‡ | 0.0036 | −0.0062 | 0.0133 | 0.466 |
| Pi10 (mm)§ | 0.0452 | −0.0152 | 0.1056 | 0.140 |
Sample size of the models: †, denotes n=68; ‡, denotes n=67; §, denotes n=69. CI, confidence interval; WA%, wall area fraction; gen., generation; Pi10, internal airway perimeter of 10 mm.