TABLE 3. Respiratory and Heart Rate Estimation Performance Comparison.
| Respiratory Rate Estimation E < 1 br/min (%) mean (± std) | Li . |
Nakajima  . [33]
|
Mean Hold |
|---|---|---|---|
| Awake, N = 50 | 83.32 (± 13.85) | 56.63 (± 17.78) | 28.72 (± 14.42) |
| Normal sleep, N = 50 | 94.20 (± 8.88) | 74.11 (± 19.42) | 32.46 (± 22.33) |
| Apnea and hypopnea, N = 50 | 83.04 (± 13.46) | 60.36 (± 20.51) | 26.12 (± 15.64) |
| All, N = 50 | 89.89 (± 10.95) | 69.10 (± 18.77) | 31.75 (± 17.37) |
| Processing time per predicted second | 0.875s (± 0.116s)* | 2.824s (± 0.229s) | N/A |
| Heart Rate Estimation E < 5 bpm (%) mean (± std) | Li . |
Balakrishnan  . [34]
|
Mean Hold |
| Awake, N = 45 | 75.42 (± 19.20) | 38.60 (± 21.82) | 66.83 (± 20.94) |
| Normal sleep, N = 45 | 79.91 (± 20.67) | 49.91 (± 26.34) | 58.43 (± 31.49) |
| Apnea and hypopnea, N = 45 | 75.34 (± 20.78) | 46.97 (± 24.03) | 54.28 (± 30.) |
| All, N = 45 | 77.97 (± 18.91) | 47.77 (± 24.09) | 58.47 (± 28.17) |
| Processing time per predicted second | 0.875s (± 0.116s)* | 0.656s (± 0.090s) | N/A |
Performance measure compared is percentage of recorded duration for which respiratory and heart rate estimates are within 1 breath/min and 5 beats per minute respectively. Processing time was calculated by taking the average run times for the analysis of the first 15 minute segment for each subject. Values shown are the mean 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, N = number of subjects,
*
Combined processing time for respiratory rate and pulse estimation