TABLE 2. Respiratory and Heart Rate Estimation Error.
| Respiratory Rate Estimation mean (± std) | E < 1 br/min (%) | E < 0.5 br/min (%) | RMSE (br/min) | MAE |
|---|---|---|---|---|
| Awake, N = 50 | 83.32 (± 13.85) | 75.36 (± 16.34) | 2.85 (± 1.82) | 1.24 (± 1.13) |
| NREM, N = 50 | 94.63 (± 9.16) | 90.03 (± 12.30) | 1.29 (± 1.26) | 0.49 (± 0.66) |
| REM, N = 46 | 92.72 (± 11.61) | 86.79 (± 14.33) | 1.34 (± 1.44) | 0.55 (± 0.63) |
| Apnea and Hypopnea, N = 50 | 83.04 (± 13.46) | 73.40 (± 17.28) | 2.74 (± 1.89) | 1.23 (± 1.07) |
| All, N =50 | 89.89 (± 10.95) | 83.65 (± 13.91) | 2.10 9 (± 1.64) | 0.82 (± 0.89) |
| Heart Rate Estimation mean (± std) | E < 5 bpm (%) | E < 2.5 bpm (%) | RMSE (bpm) | MAE |
| Awake, N = 45 | 75.42 (± 19.20) | 64.60 (± 21.00) | 8.57 (± 5.51) | 5.13 (± 4.34) |
| NREM, N = 45 | 80.18 (± 20.81) | 71.06 (± 22.68) | 6.81 (± 5.34) | 4.05 (± 4.41) |
| REM, N = 42 | 78.66 (± 22.79) | 68.69 (± 23.95) | 6.93 (± 5.16) | 4.26 (± 4.05) |
| Apnea and Hypopnea, N = 45 | 75.34 (± 20.78) | 60.05 (± 22.92) | 7.47 (± 5.41) | 4.90 (± 4.31) |
| All, N = 45 | 77.97 (± 18.91) | 67.60 (± 20.73) | 7.47 (± 4.79) | 4.36 (± 3.69) |
Error values were calculated by averaging over all subjects. std = standard deviation, br/min = breaths per minute, bpm = beats per minute, E = percent of estimation for which the absolute error is less than specified threshold, RMSE = root mean squared error, MAE = mean absolute error, N = number of subjects, NREM = non-rapid eye movement sleep, REM = rapid eye movement sleep.