Prevalence of sleep disorders in australia sleep disorder low base case high osa ahi 15 4 0 4 7 6 0 primary insomnia 1 5 3 0 restless legs syndrome 1 2 source. Until recently most of the population based studies on the prevalence of obstructive sleep apnea were focused on characterizing disease prevalence in north america europe or australia. Prevalence Of Sleep Apnea In Australia Sleep Fighting Disorder Nasal continuous positive airway pressure cpap is the standard treatment for severe obstructive sleep apnea. Prevalence of sleep apnea in australia . With the increasing appreciation that obstructive sleep apnea can lead to serious medial sequelae several studies have been undertaken to characterize the disease burden in countries including china india. Prevalence in adults ranges from 9 to 38 higher in men and older people when osa is defined as disordered breathing present on a sleep study although prevalence is in the range of 4 to 6 when osa on sleep study is combined with symp...