Fig. 2: Bland–Altman plots for the heart rate (HR) study.
From: Prospective validation of smartphone-based heart rate and respiratory rate measurement algorithms
Plots from the full study (a) followed by subgroups based on skin type (b–d) (n = 352 for all [a], 119 for subgroup 1 [b], 113 for subgroup 2 [c], and 120 for subgroup 3[d]). The reference HR was obtained from a pulse oximeter (see Methods). Dots represent individual participants; blue lines indicate the mean difference; red lines indicate the limits of agreement (based on the 2.5th and 97.5th percentiles).
