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In short, a 1-way random-effects model was used to model the difference dij of the j-th measurement for the i-th patient as follows:
dij = d + ai + eij
Where d is the unknown true difference between the ECG and PPG HR. The difference d is either the difference between the PPG and ECG HR (ie, d = HRPPG – HRECG) or the percentage difference calculated by d = d% = . ai and eij are zero-mean normally distributed, with variance and corresponding to the true between- and within-patient variances, respectively.
JMIR Cardio 2021;5(2):e27765
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