Table 2. Differences in airway collapsibility, total sleep time, and arterial oxygen saturation associated with the use of a regular pillow versus a head-positioning pillow in the entire study cohort and according to the patients’ body mass index.
|
Overall (n = 25) |
Normal-weight (n = 13) |
Overweight (n = 12) |
|||||||
|---|---|---|---|---|---|---|---|---|---|
| RP (N0) | HPP (N2) | p value | RP (N0) | HPP (N2) | p value | RP (N0) | HPP (N2) | p value | |
| Discomfort score | Reference | 3.0 (1.0, 4.0) | NA | Reference | 5.0 (2.0, 5.0)B | NA | Reference | 2.0 (0, 3.0)B | NA |
| Compliance, % | Reference | 100 (100, 100) | NA | Reference | 100 (100, 100) | NA | Reference | 100 (100, 100) | NA |
| Total sleep time, h | 7.1 (6.4, 8.0) | 6.4 (5.8, 7.4) | 0.076 | 7.5 (6.5, 8.0) | 6.3 (5.2, 7.5) | 0.020 | 7.0 (6.3, 7.5) | 6.5 (6.0, 7.0) | 0.507 |
| Mean SaO2, % | 95.8 (95.1, 96.1) | 96.1 (95.2, 96.8) | 0.742 | 95.5 (65.0, 96.4) | 95.7 (94.9, 96.9) | 0.861 | 95.9 (95.7, 96.1) | 96.1 (95.6, 96.8) | 0.327 |
| Minimal SaO2, % | 85.5 (82.3, 91.0) | 88.5 (86.0, 91.0) | 0.028 | 90.0 (84.5, 91.5)C | 90.0 (86.0, 91.2) | 0.255 | 83.0 (79.0, 91.0)C | 88.0 (85.0, 91.0) | 0.054 |
| ODI, events/h | 4.2 (1.5, 8.9) | 3.5 (1.6, 8.5) | 0.247 | 4.0 (1.3, 7.7) | 3.4 (1.0, 9.1) | 0.366 | 4.4 (2.7, 9.1) | 4.3 (2.3, 8.6) | 0.346 |
Note: Continuous data are expressed as medians and interquartile ranges. Significant p values are marked in bold.
HPP, head-positioning pillow; NA, not available; ODI, oxygen desaturation index; RP, regular pillow; SaO2, arterial oxygen saturation.
ACollapsibility was measured in the supine position.
Bp < 0.05 normal-weight patients versus overweight patients using the HPP.
Cp < 0.05 normal-weight patients versus overweight patients using the RP.