Table 2. Main clinical features and pulmonary parameters of subjects included in the study.
| T2DM | Non T2DM | P | |
| n | 30 | 60 | - |
| Age (years) | 43.2±8.0 | 42.1±8.0 | 0.529 |
| BMI (Kg/m2) | 49.1±6.3 | 49.1±6.4 | 0.989 |
| Waist circumference (cms) | 130.8±12.2 | 129.8±13.4 | 0.746 |
| Polygraphy data: | |||
| SAHS, n (%) | 24 (80.0) | 47 (78.3) | 0.855 |
| AHI (events/h) | 20.00 (4.90–114.0) | 22.70 (0.70–78.0) | 0.503 |
| CT90 (%) | 20.2±30.2 | 6.8±13.5 | 0.027 |
| Average SaO2 (%) | 94.0 (75.0–98.0) | 94.0 (88.0–98.0) | 0.277 |
| Lowest SaO2 (%) | 78.0 (49.0–90.0) | 82.0 (49.0–97.0) | 0.115 |
| Pulmonary function test: | |||
| FVC (%) * | 87.3±17.1 | 89.9±13.7 | 0.447 |
| FEV1 (%) * | 91.2±20.2 | 97.3±14.3 | 0.114 |
| FEV1/FVC (%) | 81.4±9.1 | 85.0±5.0 | 0.058 |
| TLC (%) * | 97.2±14.0 | 94.3±11.6 | 0.369 |
| RV (%) * | 100.1±22.8 | 79.7±18.1 | <0.001 |
| Arterial blood samples: | |||
| PaO2 (mmHg) | 82.3±11.4 | 83.6±8.1 | 0.574 |
| PaCO2 (mmHg) | 39.7±5.2 | 38.9±3.9 | 0.441 |
| Epworth Sleepiness Scale | 7.3±4.6 | 6.5±4.1 | 0.453 |
Data are mean±SD and median (range). T2DM: type 2 diabetes mellitus; BMI: body mass index; SAHS: sleep apnea-hypopnea syndrome; AHI: apnea-hipoapnea index; CT90: percentage of time spent with oxygen saturations below 90%; SaO2: arterial oxygen saturation; FVC: forced vital capacity; FEV1: forced expiratory volume in 1 second; TLC: total lung capacity; RV: residual volume; PaO2: arterial oxygen pressure; PaCO2: arterial carbon dioxide pressure.
*
Value expressed as a percentage of the predicted value.