Table 2.
Error statistics and Bland–Altman analyses for infant participants’ (N = 5, Study 2) interbeat intervals (in milliseconds) during the baseline and SFP play, still, and reunion episodes.
| Session (n Observations) | Absolute Mean Error | MAPE (%) | Mean Error (SD) | Bland–Altman Analysis | |
|---|---|---|---|---|---|
| Lower LoA | Upper LoA | ||||
| Baseline (n = 907) | 5.4 | 1.17% | 1.3 (7.22) | −15.45 | 12.84 |
| SFP play episode (n = 1075) | 4.4 | 0.96% | 2.0 (6.58) | −14.87 | 10.93 |
| SFP still episode (n = 936) | 6.9 | 1.66% | 1.7 (10.93) | −23.09 | 19.75 |
| SFP reunion episode (n = 1472) | 5.6 | 1.22% | 1.7 (9.29) | −19.92 | 16.49 |
Note: Except for MAPE, which is reported as a percentage, all other values are reported in milliseconds. Mean error computed as BIOPAC minus LittleBeats™ IBI. MAPE = mean absolute percent error; LoA = 95% limits of agreement.