Patients with OSA-I (n=84) Patients with OSA-II* (n=142) Total population (n=226)
Investigations prior to CPAP/NIV initiation, n (%) PG/PSG + nocturnal PtcCO2 recording PG/PSG Nocturnal SpO2 + PtcCO2 recording CPAP/NIV initiation criteria, n (%) AHI AHI + nocturnal SpO2 and PtcCO2 Nocturnal SpO2 and PtcCO2 AHI + nocturnal PtcCO2 AHI + nocturnal SpO2 PtcCO2 only SpO2 only 38 (45%) 44 (52%) 2 (2%) 64 (76%) 18 (21%) 2 (2%) 0 0 0 0 71 (50%) 65 (46%) 6 (4%) 90 (63%) 36 (25%) 8 (6%) 2 (1%) 3 (2%) 2 (1%) 1 (1%) 109 (48%) 109 (48%) 8 (4%) 154 (68%) 54 (24%) 10 (4%) 2 (1%) 3 (1%) 2 (1%) 1 (0%)