Exhaled hydrogen in patients with chronic heart failure (CHF) and controls
| CHF | Control | P values | |
| (n=108) | (n=15) | (CHF vs control) | |
| Hydrogen (H2) (ppm) | |||
| Before sleep (1) | 7.75±11.9 | 6.45±6.6 | 0.682 |
| Morning (2) | 3.43±4.4 | 8.47±12.5 | 0.003 |
| P values ((1) vs (2)) | <0.001 | 0.596 | |
| ΔH2 ((2) – (1)) | –4.32±10.7 | 2.02±7.9 | 0.030 |
Values are means±SD.