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Table 2 Correlation analysis of AHI and risk factors

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

Variables BMI Neck circumference FEV1 FEV1% of expected value FEV1 (%predicted) < 50% CAT scores ESS scores SBQ scores HADS-A scores HADS-D scores Hypertension Coronary heart disease Diabetes
r values 0.281 0.167 0.177 0.188  − 0.165 0.242 0.269 0.271 0.456 0.447 0.221 0.154 0.385
p values  < 0.001 0.001  < 0.001  < 0.001 0.001  < 0.001  < 0.001  < 0.001  < 0.001  < 0.001 0.001 0.035  < 0.001
  1. BMI body mass index; FEV1 forced expiratory volume in 1 s; CAT COPD assessment test; ESS Epworth sleepiness scale; SBQ STOP-Bang; HADS-A Hospital Anxiety and Depression Scale for anxiety; HADS-D Hospital Anxiety and Depression Scale for depression