Abbreviation	Meaning
BCG	Ballistocardiography
BA ratio	Bland-Altman ratio
CV	Coefficients of variation
ECG	Electrocardiography
HF	High-frequency range of Spectral power
HRV	Heart rate variability
LCCC	Lin’ concordance correlation coefficient
LF	Low-frequency range of Spectral power
LH/HF	Ratio of LF to HF
PW	Pulse wave
pNN50	Percentage of the difference between adjacent R-R intervals greater than 50 ms
RMSSD	Root Mean square of the difference between adjacent R-R intervals
SDNN	Standard deviation of all R-R intervals
SD1	Minor axis of notional Poincaré plot
SD2	Major axis of notional Poincaré plot