<qa>  What is the most common type of sleep apnea?Obstructive sleep apnea OSA is an important clinical disorder occurring in men, women, and children with a prevalence of 4 percent, 2 percent and 1-3 percent, respectively. OSA is under active study in adults and is definitely linked with increased cardiovascular morbidity, even in its mild to moderate clinical forms. In contrast, OSA has not been well studied in children and the potential deleterious consequences on cardiovascular function have received little or no attention. 