Table 2.

Itemized list of variables to be collected.

Type of Variable	Description
Clinical and anthropometric variables	Age, gender, and comorbidities. Physical examination: height, weight and corresponding percentiles, body mass index (BMI) and z score, neck and waist circumference, arterial blood pressure (ABP), degree of tonsil hypertrophy, Mallampati score, and maxillomandibular profile and type of bite.
HRP and PSG parameters	Sleep parameters (only PSG) Respiratory events Oximetry measures CO2 parameters (only PSG) Snore Body position Heart rate
Questionnaires	Sleepiness rating log Pediatric sleep questionnaire (PSQ) Bears test (Bedtime, Excessive daytime sleepiness, Awakening, Regularity, Sleep-disordered breathing) CSHQ (Children’s Sleep Habits Questionnaire) Kiddy-KINDL quality of life of children. Pictorial-Based Declarative Memory Questionnaire
Morning First void urine sample	50 mL aliquots preserved at −80 °C.