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Fig. 3 | BMC Pulmonary Medicine

Fig. 3

From: Effect of arterial blood bicarbonate (HCO3) concentration on the accuracy of STOP-Bang questionnaire screening for obstructive sleep apnea

Fig. 3

A 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)

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