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Concordance as a function of target frequency in HRV power spectra: concordance between ECG-derived and smartwatch-derived power content in arbitrary overlapping segments of 0.01 Hz width for all participants (A) as well as STEMI cohort (B), STROKE cohort (C), and CONTROL cohort (D) alone. r, Spearman’s rank correlation coefficient; ρc, Lin’s concordance correlation coefficient.
