Figure 5. Bland-Altman plots comparing reference CPX data and Earbud (DUT) benchmark data collective simultaneously.
a) distance traveled; b) VO2max (ml/kg/min); EE (kilocalories). Nine subjects were studied in this CPX validation group study. The mean is shown by the green line, and the 1.96 SD (95% limits of agreement) boundaries are shown by the red lines.