Table 5.
Correlation between the degree of airflow limitation in COPD (GOLD classification) and the severity of OSA (n, %)
| GOLD classification | Cases (n = 842) | AHI < 5 times / h (n = 286) | 5 times / h ≤ AHI < 15 times / h (n = 362) | 15 times / h ≤ AHI < 30 times / h (n = 123) | AHI ≥ 30 times / h (n = 71) |
|---|---|---|---|---|---|
| I | 110(13.06%) | 19(6.64%) | 49(13.54%) | 22(17.89%) | 20(28.17%) |
| II | 320(38.00%) | 94(32.87%) | 148(40.88%) | 47(38.21%) | 31(43.66%) |
| III | 304(36.10%) | 124(43.36%) | 127(35.08%) | 38(30.89%) | 15(21.13%) |
| IV | 108(12.83%) | 49(17.13%) | 38(10.50%) | 16(13.01%) | 5(7.04%) |
| χ2 value | – | 29.247 | 4.363 | 3.652 | 21.035 |
| P value | – | < 0.001 | 0.225 | 0.302 | < 0.001 |
AHI apnea–hypopnea index;