Background: The availability of poly(somno)graphy [P(S)G] for sleep apnea (SA) diagnosis is limited, making pre-test case evaluation an important challenge. The Neck, Obesity, Snoring, Age, Sex (NoSAS) and STOP-Bang (SBQ) scores are accepted screening tests, but their sex-specific performance in the general population is unknown.
Objective: To compare the sex-specific diagnostic characteristics of the NoSAS and SBQ scores, and to optimize the performance of these tools for men and women.
Methods: Participants from a population-based cohort (n = 2205) underwent clinical evaluation, including NoSAS, SBQ, and home polygraphy.
Results: We obtained successful polygraphy in 1809 participants. Moderate-to-severe SA was present in 11.7%. Diagnostic performance indices of NoSAS and the SBQ calculated on the overall group (men + women) overestimated the performance in both sexes separately. The sensitivity of NoSAS for an apnea/hypopnea index (AHI) ≥15 h was acceptable in men (87.1%), but low in women (55.3%). The reverse was true for the specificity (39.9% in men, 87.4% in women). A similar sex-specific difference in diagnostic performance was seen with the SBQ. Using women-specific cut-offs for the scores (NoSAS ≥6 or SBQ ≥2) and neck circumference (>35 cm) increased the sensitivity in women to levels similar to men (88.5 and 87.2%). Although specificity decreased, it still remained higher than in men.
Conclusion: In women, the sensitivity of NoSAS and the SBQ is too low for SA screening in the general population. Sex-specific cut-offs reverse this imbalance and achieve test sensitivities in women similar to those in men, whilst still retaining higher specificities than in men. Sleep questionnaires performance reporting should be sex-stratified.
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