Table 1. General characteristics of the entire study cohort and according to the patients’ body mass index.
| Entire cohort (n = 25) |
Weight status |
|||
|---|---|---|---|---|
| Normal-weight (n = 13) | Overweight (n = 12) | p value | ||
| Body mass index (kg/m2) | 24.8 (23.1, 26.4) | 23.2 (22.4, 23.8) | 26.4 (25.8, 27.5) | <0.001 |
| Age, years | 47.0 (32.0, 53.0) | 50.0 (31.0, 57.0) | 42.5 (36.3, 52.0) | 0.650 |
| Sex (male, %) | 21 (84) | 11 (85) | 10 (83) | 1.000 |
| Neck circumference (cm) | 38.0 (36.0, 40.0) | 37.0 (33.0, 38.8) | 40.0 (37.1, 40.0) | 0.022 |
| Snoring severity | 5.0 (5.0, 7.5) | 7.0 (5.0, 8.0) | 5.0 (4.3, 6.0) | 0.247 |
| S-Retropalatal-ColTD (%)A | 27.0 (13.6, 51.2) | 18.8 (11.7, 43.1) | 32.6 (16.1, 52.9) | 0.437 |
| S-Retropalatal-ColLD (%)A | 28.3 (11.1, 51.1) | 28.3 (11.4, 50.3) | 29.6 (−6.8, 59.4) | 0.769 |
| S-Retroglossal-ColTD (%)A | 14.2 (6.9, 23.4) | 12.8 (4.1, 25.1) | 15.7 (12.4, 24.4) | 0.406 |
| S-Retroglossal-ColLD (%)A | −2.3 (−15.2, 15.1) | −8.1 (−50.9, 1.5)B | 3.7 (−7.8, 29.6) | 0.052 |
| L-Retropalatal-ColTD (%)A | 37.6 (20.6, 466.9) | 31.1 (14.0, 46.8) | 40.3 (26.2, 49.3) | 0.205 |
| L-Retropalatal-ColLD (%)A | 23.6 (−4.2, 52.6) | 20.9 (−12.9, 44.7) | 34.1 (−3.2, 54.1) | 0.376 |
| L-Retroglossal-ColTD (%)A | 9.6 (6.9, 20.2) | 9.1 (8.0, 17.5) | 17.6 (4.7, 33.4) | 0.538 |
| L-Retroglossal-ColLD (%)A | −0.8 (−21.0, 10.5) | −1.9 (−21.9, 12.3)B | −0.6 (−3.3, 12.5) | 0.611 |
| AHItotal, events/h | 7.0 (6.0, 15.2) | 7.0 (6.4, 13.8) | 7.0 (5.5, 17.8) | 0.852 |
| AHIsupine, events/h | 10.1 (6.9, 22.0) | 10.1 (7.6, 27.2) | 10.4 (5.8, 21.7) | 0.650 |
| AHInonsupine, events/h | 2.2 (0.9, 3.7) | 2.0 (0.9, 2.9) | 2.4 (0.5, 7.2) | 0.611 |
| AHIsupine:AHInonsupine ratio | 4.0 (2.6, 18.4) | 8.7 (2.7, 18.6) | 3.0 (2.5, 17.4) | 0.470 |
| Mean SaO2, % | 95.0 (94.0, 96.0) | 95.0 (94.5, 95.5) | 95.0 (94.0, 96.0) | 0.810 |
| Minimal SaO2, % | 87.0 (85.0, 89.0) | 87.0 (86.0, 89.5) | 85.0 (82.8, 88.5) | 0.137 |
| ODI (4%), events/h | 6.6 (3.3, 11.2) | 6.6 (3.3, 9.9) | 6.8 (2.8, 17.6) | 0.538 |
Note: Continuous data are expressed as medians and interquartile ranges, whereas categorical data are given as counts and percentages. Significant differences are marked in bold. AHI, apnea-hypopnea index; ColLD, collapsibility of longitudinal dimension; ColTD, collapsibility of transverse dimension; L, lateral position; ODI, oxygen desaturation index; S, supine position; SaO2, arterial oxygen saturation.
ACollapsibility was measured in the supine position using the head-positioning pillow.
Bp < 0.05 supine position versus lateral position using the HPP.