Table 3.
Result of applying inferential statistics test on extracted features from the SpO2 raw signal.
| Feature | Healthy, n = 197 (Mean ± std) |
At Risk, n = 256 (Mean ± std) |
Shapiro–Wilk | Mann Whitney U |
|---|---|---|---|---|
| p-Value | p-Value | |||
| ndes2ph | 82.91 ± 58.31 | 189.94 ± 107.56 | < 1 × 10−15 | < 1 × 10−30 |
| ndes3ph | 28.13 ± 20.45 | 91.67 ± 63.06 | < 1 × 10−20 | < 1 × 10−40 |
| ndes4ph | 10.08 ± 8.44 | 47.17 ± 40.32 | < 1 × 10−20 | < 1 × 10−40 |
| ndes5ph | 4.41 ± 4.49 | 26.51 ± 26.97 | < 1 × 10−25 | < 1 × 10−40 |
| odi3 | 2.79 ± 2.08 | 10.53 ± 7.38 | < 1 × 10−20 | < 1 × 10−45 |
| odi4 | 0.98 ± 0.83 | 5.53 ± 4.81 | < 1 × 10−25 | < 1 × 10−45 |
| pctle90 | 0.06 ± 0.69 | 0.29 ± 0.51 | < 1 × 10−35 | < 1 × 10−25 |
| pctle92 | 0.38 ± 3.49 | 0.81 ± 1.37 | < 1 × 10−35 | <1 × 10−25 |
ndes2ph, number of desaturations ≥ 2% per hour; ndes3ph, number of desaturations ≥ 3% per hour; ndes4ph, number of desaturations ≥ 4% per hour; ndes5ph, number of desaturations ≥ 5% per hour; odi3, oxygen desaturation index ≥ 3% during sleep time; odi4, oxygen desaturation index ≥ 4% during sleep time; pctle90, percentage of time desaturation was ≤ 90%; pctle92, percentage of time desaturation was ≤ 92%.