Table 2.
Descriptive Statistics of NRT and DP across the sleep-related fatigue levels NO, RR, and HR.
| Normal | Reduced risk | High risk | |
|---|---|---|---|
| Number of events | 6811 | 7136 | 6235 |
| NRT | |||
| Mean | 1.9172 | 2.0589 | 2.8199 |
| Standard deviation | 1.6897 | 3.2471 | 9.2638 |
| Quartile dispersion | 0.2331 | 0.2581 | 0.2935 |
| DP | |||
| Mean | 1.6873 | 1.7046 | 1.8858 |
| Standard deviation | 0.5986 | 0.6274 | 0.7987 |
| Quartile dispersion | 0.22097 | 0.2315 | 0.2579 |
The transformation NRT to DP provides distributions with lower variability, but with similar quartiles dispersion structure.