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Table 3 Values of SBQ ≥ 3 points combined with an HCO3 concentration ≥ 24.6 mmol/L for screening for OSA (%)

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

Cutoff value AHI ≥ 5 AHI ≥ 15 AHI ≥ 30
SBQ ≥ 3 points    
 Sensitivity 97.5 98.1 98.9
 Specificity 25.0 17.1 15.1
SBQ ≥ 3 points + HCO3≥24.6 mmol/L    
 Sensitivity 79.2* 84.5* 86.8*
 Specificity 75.1* 65.9* 58.5*
  1. AHI = apnea hypopnea index, SBQ = STOP-Bang questionnaire
  2. Annotation: *Compared with the SBQ score ≥ 3 group, P < 0.01