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The correlation between PSQI scores and the value of lung function parameters in CHD patients. A, MVV, minute ventilation; B, PaO2, partial pressure of oxygen; C, PaCO2, partial pressure of arterial carbon dioxide; D, SpO2, oxygen saturation measurement by pulse oximetry; E, FEV1, forced expiratory volume in 1 second; F, FVC (forced vital capacity). There was a strong positive correlation if rho > 0.5 and or a strong negative correlation if rho < -0.5.
