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Table 1 Baseline characteristics according to AHI level
| Variable | Low AHI (<15 events/hour) | High AHI (≥15 events/hour) | p |
|---|---|---|---|
| Number (n) | 96 | 42 | |
| Female gender (%) | 76 (79) | 20 (48) | <0.001 |
| Age (years) | 43.0 (11.1) | 48.2 (9.4) | 0.009 |
| BMI (kg/m2) | 44.4 (5.0) | 46.8 (6.6) | 0.022 |
| Surgical treatment (%) | 50 (52) | 26 (62) | 0.353 |
| Arterial blood gases | |||
| pO2 (kPa) | 11.8 (1.3) | 10.7 (1.4) | <0.001 |
| pCO2 (kPa) | 5.1 (0.5) | 5.5 (0.5) | 0.001 |
| Diffusing capacity | |||
| DLCO (diffusing capacity for carbon monoxide) (% pred) | 93 (13) | 92 (17) | 0.752 |
| DLCO/VA (diffusing capacity for CO/alveolar volume) (% pred) | 106 (15) | 111 (19) | 0.135 |
| Dynamic lung volumes | |||
| FVC (forced vital capacity) (% pred) | 104 (14) | 98 (16) | 0.055 |
| FEV1 (forced vital capacity first second) (% pred) | 94 (15) | 93 (20) | 0.680 |
| Static lung volumes | |||
| TLC (total lung capacity) (% pred) | 100 (13) | 94 (13) | 0.033 |
| IC (inspiratory capacity) (% pred) | 123 (22) | 115 (25) | 0.098 |
| VC (vital capacity) (% pred) | 100 (15) | 96 (18) | 0.136 |
| FRC (functional residual capacity) (% pred) | 82 (17) | 79 (16) | 0.315 |
| ERV (expiratory reserve volume) (% pred) | 48 (35) | 49 (34) | 0.885 |
| RV (residual volume) (% pred) | 101 (28) | 97 (27) | 0.493 |
