Table 2.
Results of initial PSG testing and ‘split test’ in patients with none/mild and moderate/severe OSA§
| PSG testing | Total | OSA* |
p value | |
|---|---|---|---|---|
| none/mild | moderate/severe | |||
| Initial PSG testing | (N = 218) | (N = 125) | (N = 93) | |
| AHI, number/h | 12 (5, 29) | 6 (3, 11) | 40 (21, 68) | <0.001 |
| Mean SpO2, % | 93 (92, 94) | 94 (92, 95) | 92 (90, 94) | <0.001 |
| Percent TST SpO2 < 90% | 2.9 (0.4, 10.3) | 1.1 (0.1, 3.6) | 9.8 (3.0, 32.3) | <0.001 |
| Split PSG testing | (N = 185) | (N = 98) | (N = 87) | |
| AHI, number/h | 2 (1, 6) | 1 (1, 3) | 3 (1, 9) | <0.001 |
| Mean SpO2, % | 94 (93, 96) | 95 (93, 96) | 94 (92, 95) | 0.003 |
| Percent TST SpO2 < 90% | 0.1 (0.0, 1.9) | 0.0 (0.0, 0.6) | 0.2 (0.0, 4.3) | 0.002 |
TST = Total sleep time; SpO2 = oxyhemoglobin saturation measured by pulse oximetry.
§
All values are median and IQR; PSG results were compared between groups using the rank sum test.
*
None/mild OSA (AHI ≤ 15); moderate/severe OSA (AHI ≥ 16).