SRBD survey
We administered the SRBD questionnaire, a 22-item survey divided into 3 domains, nighttime, daytime and cognitive symptoms. Symptoms evaluated include snoring, observed apneas, difficulty breathing during sleep, daytime sleepiness, inattention/hyperactivity, enuresis, morning headache, delayed growth and obesity 14,15. The number of symptom-items endorsed positively (“yes”) is divided by the number of items answered positively or negatively; resulting in a proportion that ranges from 0.0 to 1.0. The details on the development of the SRBD and score calculation have also been previously published15. We used an SRBD score of 0.33 as the screening threshold for OSA14, since this threshold has been previously shown to offer the best OSA screening accuracy.