Obstructive sleep apnea is the most prevalent of sleep disordered breathing.
Its reported prevalence varies widely depending on:

• demographics of the population studied
• the definition of the disorder
• the method of diagnosis

The estimates of mild obstructive sleep apnea are in the range of 1 in 4 males and 1 in 10 females in the general population.

Moderate obstructive sleep apnea estimates are in the range of 1 in 9 males and 1 in 20 females.

Globally, 100 million people are thought to have the condition, with an overwhelming 80% of them remaining undiagnosed.