Researchers analyzed 31 studies involving patients with obstructive sleep apnea from sleep clinics and community settings. They evaluated the diagnostic accuracy of the NoSAS score, which uses neck circumference, obesity, snoring, age, and sex to estimate apnea risk. The study compared these results against polysomnography or other validated references to determine sensitivity and specificity for different disease stages.
The results indicated that the score performed differently for mild, moderate, and severe apnea. For mild cases, sensitivity was 71% and specificity was 66%. For moderate cases, sensitivity rose to 73% while specificity dropped to 62%. In severe cases, sensitivity reached 82%, but specificity fell to 50%, meaning many severe cases might be missed.
The study noted a high degree of heterogeneity among the included research, which limits how confidently these numbers can be applied universally. While the score may be useful in resource-limited settings where advanced testing is unavailable, the variation in results suggests it should not replace standard diagnostic tools without further validation. Readers should view these findings as preliminary indicators rather than definitive proof of the score's universal reliability.