Validation of a Portuguese version of the STOP-Bang questionnaire as a screening tool for obstructive sleep apnea: Analysis in a sleep clinic

May 1, 2015Revista portuguesa de pneumologia

Testing the Portuguese STOP-Bang Questionnaire for Detecting Obstructive Sleep Apnea in a Sleep Clinic

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Abstract

A STOP-Bang score of 6 indicates a 95% probability of obstructive sleep apnea (OSA).

In a study of 215 patients, OSA was present in 78%, with 33% experiencing moderate and 37% severe cases.
A STOP-Bang score of 3 had a sensitivity of 93.4% and a positive predictive value of 86.6% for diagnosing OSA.
Higher STOP-Bang scores correlated with increased probabilities of both OSA and severe OSA.
A score of 3 and 2 provided negative predictive values of 85.3% and 91.7% for moderate/severe OSA, respectively.
The Portuguese version of the STOP-Bang questionnaire may effectively stratify patients for OSA diagnosis.

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INTRODUCTION: Screening methods have become increasingly important owing to the growing number of patients suspected of obstructive sleep apnea (OSA) being referred for sleep consultation. The STOP-Bang questionnaire has been validated as a screening tool for OSA in surgical patients.

OBJECTIVES: To evaluate the performance of a Portuguese version of the STOP-Bang questionnaire for the diagnosis of OSA in a sleep clinic.

METHODS: Prospectively, for 2 months, all patients referred to our clinic for clinical evaluation completed a translated version of the STOP-Bang questionnaire in Portuguese and underwent a sleep study.

RESULTS: We observed 216 patients and 215 (99.5%) were included. Age was 53.63±13.10 years, 63.3% were male patients, neck circumference was 40.4±44.11 cm and BMI was 29.41 [26.85; 33.06] kg/m(2). OSA was present in 78% of the patients, of whom, 33% had moderate and 37% had severe OSA. A STOP-Bang score ≥3 had a sensitivity and positive predictive value (PPV) for OSA of 93.4% and 86.6%, respectively. Each increase in the STOP-Bang score was associated with an increase in the probability of OSA and severe OSA; reaching a 95% OSA probability, for a score of 6, and a 73% severe OSA probability, for a score of 8. A score of 3 and 2 had a negative predictive value for moderate/severe OSA of 85.3% and 91.7%, respectively.

CONCLUSIONS: The STOP-Bang questionnaire showed high sensitivity and PPV for OSA with the probability of severe OSA steadily increasing, the higher the scores. Furthermore, a low score showed high predictive value for the exclusion of moderate/severe OSA. The STOP-Bang questionnaire can be a powerful tool for stratifying patients in the diagnosis of OSA.

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Validation of a Portuguese version of the STOP-Bang questionnaire as a screening tool for obstructive sleep apnea: Analysis in a sleep clinic

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