Comparison of pNN50 with pNN20
| Age (years) | |||||||
|---|---|---|---|---|---|---|---|
| Group | Number | Mean | Range | Duration (hours) | Heart rate (beats/min) | pNN50 (%) | pNN20 (%) |
| Values are mean (SD). | |||||||
| Figure 2 shows p values for pNN50 and pNN20 statistics. | |||||||
| CHF, congestive heart failure. | |||||||
| Normal | 72 | 54.6 | 20–76 | 24 | 76.7 (7.4) | 7.9 (7.8) | 31.3 (12.9) |
| CHF | 43 | 55.5 | 22–79 | 24 | 88.9 (12.9) | 2.3 (2.9) | 13.5 (10.8) |
| Sleeping | 72 | 54.6 | 20–76 | 6 | 63.2 (6.9) | 15.0 (15.6) | 44.2 (17.5) |
| Waking | 72 | 54.6 | 20–76 | 6 | 87.7 (9.6) | 4.2 (4.9) | 23.5 (12.2) |
| Young | 20 | 25.9 | 21–34 | 2 | 62.2 (8.5) | 30.7 (19.9) | 63.3 (15.4) |
| Elderly | 20 | 74.5 | 68–85 | 2 | 57.8 (8.7) | 6.3 (8.1) | 32.9 (17.8) |