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The association between CAI and severe AECOPD events
| CAI category
|
A
|
B
|
C
|
D
|
Total |
|---|---|---|---|---|---|
| CAI description | Good | Moderate | Unhealthy | Very unhealthy | |
| Total number of days | 94 | 696 | 82 | 10 | 882 |
| Total number of inpatients (cases) | 24 | 311 | 33 | 6 | 374 |
| Average number of inpatients per day (cases/day) | 0.26 | 0.45 | 0.40 | 0.60 |
Abbreviations: CAI, Comprehensive Air-quality Index; AECOPD, acute exacerbations of chronic obstructive pulmonary disease.
