Table 1. Participant Characteristics.
| Variable | Nocturia | No nocturia | P value |
| Age (years) | 64.2±10.5 | 61.2±11.3 | <0.0001 |
| Men (proportion) | 56.7% | 57.6% | 0.49 |
| Body Mass Index (Kg/m2) | 28.7±5.5 | 28.3±5.2 | 0.007 |
| FEV1 (Liters) | 2.62±0.80 | 2.77±3.3 | 0.02 |
| Alcohol consumption (drinks per night) | 0 (0, 3) | 0 (0, 4) | 0.49 |
| Diuretic intake (proportion) | 17.0% | 13.4% | <0.0001 |
| Diabetes Mellitus (proportion) | 11.4% | 10.0% | 0.08 |
| Alpha blockers (proportion) | 6.1% | 2.8% | <0.0001 |
| AHI (4% hypopnea) | 4.6 (1.6, 11.1) | 5.7 (1.9, 13.9) | <0.0001 |
| Patients with AHI >15 events/hr | 23.2% | 17.4% | <0.0001 |
| Patients with AHI >10 events/hr | 33.9% | 27.3% | <0.0001 |
| Patients with AHI >5 events/hr | 39.8% | 48.2% | <0.0001 |
Kg/m2 = kilogram/meter2; FEV1 = Forced expiratory volume; hr = hour; proportions compared by Chi square; Mann-Whitney test for non-parametrics (presented as median and interquartile range); unpaired t-test for parametric variables (presented as mean ± SD); AHI = apnea-hypopnea index.