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Table 3 Results of univariate logistic regression used to explore risk factors for COPD coexisting OSA (AHI > 15 times per hour)

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

Variables β Wald P OR 95% CI
Age 0.019 2.017 0.142 1.017 0.992 ~ 1.041
BMI (kg/m2) 0.178 32.158  < 0.001 1.186 1.115 ~ 1.258
Neck circumference 0.186 12.452  < 0.001 1.201 1.114 ~ 1.289
FEV1 0.006 2.457 0.047 1.009 1.000 ~ 1.019
FEV1% of expected value 0.025 0.141 0.463 0.958 0.841 ~ 1.075
FEV1 (%predicted) < 50%  − 0.621 7.412 0.041 0.551 0.412 ~ 0.691
CAT scores 0.201 32.263  < 0.001 1.305 1.121 ~ 1.490
ESS scores 0.137 9.524  < 0.001 1.128 1.074 ~ 1.182
SBQ scores 0.223 17.623  < 0.001 1.311 1.125 ~ 1.498
HADS-A scores 0.243 29.132  < 0.001 1.324 1.131 ~ 1.517
HADS-D scores 0.251 30.541  < 0.001 1.301 1.122 ~ 1.481
Hypertension 0.351 35.022 0.029 2.011 1.551 ~ 2.470
Coronary heart disease 0.133 5.851 0.045 1.148 1.006 ~ 1.291
Diabetes 0.402 37.112  < 0.001 2.055 1.442 ~ 2.669
  1. Overlap syndrome (AHI > 15 times per hour) was considered as the dependent variable and age, BMI, neck circumference, FEV1, FEV1% of expected value, FEV1(%predicted) < 50%, CAT score, ESS score, SBQ scores, HADS-A scores, HADS-D scores, hypertension, coronary heart disease and diabetes as independent variables. 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