2.2 Patient characteristics
Age, sex, past medical and surgical history were noted. Based upon
medical records, patients were divided into DS and non-DS cohorts.
Within the DS cohort, any co-morbidity associated with DS was recorded.
In particular, past cardiothoracic surgical history was noted, as was a
history of upper airways surgery. Within the non-DS cohort the diagnosis
of OSA or a syndrome or genetic alteration associated with sleep
disordered breathing was recorded. The cohorts were divided into three
age groups; age group one (0-5years), age group two (5-10years) and age
group three (>10years).