Table 2.
PSG summary comparison (baseline vs during titration studies).
| BPAP (n = 16) | CPAP (n = 16) | |
|---|---|---|
| Age (y) | 57 (9.7) | 65 (10.7) |
| Sex (% female) | 50 | 13 |
| BMI (kg/m2) | 45 (7.8) | 40 (5.8) |
| Baseline PSG | ||
| AHI (events/h) | 57 (34) | 61 (37) |
| % TST < 90% | 93 (70–99) | 84 (58–96) |
| % TST < 80% | 28 (12–47) | 17 (5–37) |
| Nadir SpO2 (%) | 47 (40–64) | 52 (45–64) |
| Titration study 1 | ||
| % TST < 90% | 44 (4–85) | 67 (37) |
| % TST < 80% | 0 (0–0) | 19 (27) |
| Nadir SpO2 (%) | 82 (78–86) | 66 (16) |
| Titration study 2 | ||
| AHI (events/h) | 7 (9) | |
| % TST < 90% | 15 (2–42) | |
| % TST < 80% | 0 (0–0) | |
| Nadir SpO2 (%) | 84 (81–86) | |
Baseline diagnostic PSG and titration study 1 (16 patients in each arm) were done at time of recruitment, and titration study 2 was done after exit from trial (data from 17 patients available). The majority of titration study 2 were CPAP studies. The age, BMI, and AHI are displayed as mean (standard deviation). The % TST < 90%, % TST < 80%, and nadir SpO2 are displayed as median (interquartile range). AHI = apnea-hypopnea index, BMI = body mass index, BPAP = bilevel positive airway pressure, CPAP = continuous positive airway pressure, PSG = polysomnography, TST = total sleep time.