Table 1.
Differences between diagnostic and pressure titration PSG.
| Diagnostic PSG n = 501 | Pressure titration study n = 501 | Mean difference n = 501 | p value | |
|---|---|---|---|---|
| Median | Median | Median | ||
| TST, minutes | 430.00 (390.25,456.50) | 409.00 (368.25,440.50) | − 19.50 (− 62.50,16.75) | 0.000*** |
| SL, minutes | 10.50 (5.00,19.50) | 12.00 (6.50,22.50) | 1.50 (− 5.00,10.50) | 0.000*** |
| SE, % | 87.76 (79.60,93.10) | 85.76 (77.05,92.36) | − 1.12 (− 7.78,3.99) | 0.000*** |
| WASO, minutes | 46.00 (23.50,82.18) | 49.50 (24.50,87.75) | 2.50 (− 22.25,32.27) | 0.045* |
| Arousal Index | 9.25 (2.48,28.25) | 0.90 (0.30,2.30) | − 4.40 (− 22.45,0.00) | 0.000*** |
| N1 duration, minutes | 116.00 (75.25,174.75) | 66.50 (45.00,100.25) | − 42.50 (− 103.00,− 8.25) | 0.000*** |
| N2 duration, minutes | 221.00 (158.50,262.75) | 195.00 (148.75,230.75) | − 20.00 (− 67.25,35.75) | 0.000*** |
| N3 duration, minutes | 1.00 (0.00,23.50) | 37.00 (16.00,63.25) | 22.50 (1.50,48.25) | 0.000*** |
| REM duration, minutes | 58.50 (40.25,77.00) | 81.50 (57.50,108.25) | 21.00 (− 4.50,51.50) | 0.000*** |
| %N1 | 27.80 (18.67,42.31) | 16.98 (11.17,25.54) | − 10.03 (− 22.81,− 0.88) | 0.000*** |
| %N2 | 52.98 (41.17,61.25) | 49.20 (39.74,57.39) | − 1.99 (− 13.10,9.03) | 0.016* |
| %N3 | 0.21 (0.00,5.72) | 9.78 (4.18,15.80) | 5.87 (0.58,12.01) | 0.000*** |
| %REM | 13.72 (10.26,17.57) | 20.08 (15.69,26.01) | 5.48 (0.64,13.21) | 0.000*** |
| AHI | 50.05 (34.34,68.20) | 1.52 (0.26,4.19) | − 47.20 (− 63.48,− 30.87) | 0.000*** |
| NAHI | 50.06 (33.74,69.81) | 1.52 (0.19,4.64) | − 47.20 (− 64.91,− 30.50) | 0.000*** |
| RAHI | 50.96 (32.14,64.39) | 0.46 (0.00,2.41) | − 47.54 (− 62.86,− 29.02) | 0.000*** |
| Mean duration of AH, minutes | 0.39 (0.32,0.49) | 0.27 (0.20,0.33) | − 0.14 (− 0.28,− 0.05) | 0.000*** |
| Total duration of AH, minutes | 132.00 (76.70,236.20) | 2.80 (0.40,8.35) | − 128.30 (− 221.35,− 69.55) | 0.000*** |
| Mean SpO2 | 93.00 (90.00,94.00) | 96.00 (95.00,97.00) | 3.00 (2.00,5.00) | 0.000*** |
| Nadir SpO2 | 73.00 (60.00,81.00) | 89.00 (85.00,92.00) | 15.00 (9.00,26.00) | 0.000*** |
| ODI | 38.30 (18.01,65.18) | 1.18 (0.00,4.95) | − 34.50 (− 58.95,− 16.42) | 0.000*** |
AH apnea and hypopnea, AHI apnea–hypopnea index, NREM non-rapid eye movement sleep, NAHI non-rapid eye movement sleep apnea–hypopnea index, ODI oxygen desaturation index, RAHI non-rapid eye movement sleep apnea–hypopnea index, REMs rapid eye movement sleep, SE Sleep efficiency, SL sleep latency, SpO2 pulse oxygen saturation, TST Total sleep time, WASO wake after sleep onset.