Journal of Healthcare Engineering

Research Article

Analysis of a Pulse Rate Variability Measurement Using a Smartphone Camera

Table 3

Comparison values for the correspondence values among PRV and HRV indices, when comparing PPG to ECG, and the channels of ECG. Here, PC stands for the Pearson correlation coefficient (with values smaller than 10⁻¹⁰), m and b represent the coefficients for the linear regression, and bias, SD, and BAR values are for the Bland-Altman analysis. The worst values are in bold.


		ECG-PPG	ECG(1)-ECG(2)	ECG(1)-ECG(3)	ECG(2)-ECG(3)

Mean RR (ms)	PC	1	1	1	1
	m	1	1	1	1
	b	−0.019	−0.025	0.028	0.032
	Bias	−0.021	0.0015	0.007	−0.003
	SD	0.0093	0.021	0.061	0.026
	BAR	<0.001	<0.001	<0.001	<0.001

RMSSD (ms)	PC	0.996	1	0.998	0.999
	m	0.998	1.004	0.99	0.99
	b	2.53	−0.25	0.67	0.87
	Bias	2.64	−0.13	0.43	0.46
	SD	1.79	0.44	1.21	1.01
	BAR	0.104	0.027	0.076	0.07

SDNN (ms)	PC	0.998	1	1	1
	m	1.005	1.002	1.001	0.998
	b	1.055	−0.113	0.075	0.162
	Bias	1.27	−0.020	0.136	0.092
	SD	0.776	0.148	0.464	0.260
	BAR	0.035	0.0068	0.021	0.012

pNN50 (%)	PC	0.993	0.999	0.995	0.998
	m	1.07	0.988	0.993	0.997
	b	1.67	0.076	0.305	0.122
	Bias	2.67	−0.083	0.221	0.094
	SD	2.43	0.869	1.631	0.918
	BAR	0.306	0.125	0.250	0.168

TP (total power, ms²)	PC	0.998	1	1	1
	m	1.04	1.003	1.009	1.005
	b	16.52	−3.01	−2.49	−2.032
	Bias	50.15	−0.484	5.261	1.788
	SD	46.15	8.768	21.84	13.83
	BAR	0.10	0.019	0.048	0.0335

LP (low-frequency power, ms²)	PC	1	1	1	1
	m	1.05	1	1.004	1
	b	−1.14	0.26	0.167	0.307
	Bias	15.96	0.16	1.50	0.243
	SD	16.03	2.26	5.74	2.43
	BAR	0.089	0.012	0.033	0.015

HP (high-frequency power, ms²)	PC	0.995	1	0.999	0.999
	m	1.06	1.002	1.017	1.013
	b	18.514	−0.94	−0.586	−1.18
	Bias	33.87	−0.55	3.68	1.49
	SD	33.18	7.71	16.41	11.91
	BAR	0.247	0.064	0.13	0.11