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Table 5 Correlation between the degree of airflow limitation in COPD (GOLD classification) and the severity of OSA (n, %)

From: Predictors and outcomes of obstructive sleep apnea in patients with chronic obstructive pulmonary disease in China

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
  1. AHI apnea–hypopnea index;