This single-center, randomized, controlled study was conducted at the Süreyyapaşa Chest Diseases and Thoracic Surgery Training and Research Hospital in Istanbul between June 2014 and April 2015. Eligible OSA patients were randomized to Standard Support (SS) group (general information about OSA and PAP treatment at baseline), or to Educational Support (ES) group (additional polysomnography chart viewing from both diagnostic and titration nights). All patients were scheduled to five PAP control visits between 2 weeks and 6 months after the PAP prescription. Primary outcome was the PAP compliance (4 h/night for 70% of all the nights) at the last visit.