The Indices of Instantaneous Pulse Rate Variability Are Indicators for Daily Life Quality Assessment in Patients with COPD

Table 3

Correlation between iPRV indices and questionnaires.

Variables	LF	HF	VHF	nLF^a	nHF^a	LF/HF	nLF^b	nHFb	nVHF^b
Phase A
mMRC	0.09	−0.02	−0.07	0.32	−0.32	0.32	0.31	−0.18	−0.08
CAT	0.47	0.31	0.20	0.11	−0.11	0.11	0.12	0.06	−0.26
Phase B
mMRC	0.15	0.09	0.07	0.78	−0.78	0.78	0.62	−0.61	0.19
CAT	−0.13	−0.18	−0.20	0.28	−0.28	0.28	0.17	−0.21	0.02
B-A
mMRC	0.03	−0.22	−0.1	0.60	−0.60	0.63	0.58	−0.58	0.18
CAT	−0.3	−0.64	−0.55	0.39	−0.39	0.50	0.39	−0.53	0.19

p-value< 0.05. p-value<0.01. B-A difference score of mMRC was −0.36 ± 1.34 and CAT was −3.14 ± 6.54.