Fig. 3From: Effect of arterial blood bicarbonate (HCO3−) concentration on the accuracy of STOP-Bang questionnaire screening for obstructive sleep apneaA HCO3− concentration predicts OSA as demonstrated by the corresponding area under the ROC curve (AUC) being 0.80; B a combination of the SBQ questionnaire score and arterial HCO3− concentration is more predictive of OSA than either alone. Corresponding AUC of the OSA group was 0.613 (P > 0.05). When the combined SBQ score was ≥ 3 and the HCO3− concentration was ≥ 24.6 mmol/L, the corresponding AUC in the OSA group increased to 0.771 (P < 0.01)Back to article page