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

Table 4

Correlation between iPRV indices and each subquestion of CAT in phase A.

Variables	LF	HF	VHF	nLF^a	nHF^a	LF/HF	nLF^b	nHFb	nVHF^b
CAT1	0.41	0.37	0.23	0.01	−0.01	0.01	0.26	0.21	−0.38
CAT2	0.33	0.17	0.09	0.08	−0.08	0.08	0.11	−0.08	−0.20
CAT3	0.24	0.26	0.22	−0.06	0.06	−0.06	0.12	0.49	−0.33
CAT4	−0.12	−0.21	−0.28	0.22	−0.22	0.22	0.15	−0.36	0.11
CAT5	0.03	0.12	0.08	0.02	−0.02	0.02	0.04	0.01	0.04
CAT6	−0.18	−0.46	−0.41	0.32	−0.32	0.32	0.02	−0.38	0.02
CAT7	0.58	0.49	0.40	0.00	0.00	0.00	0.07	0.05	−0.21
CAT8	0.34	0.36	0.39	−0.17	0.17	−0.17	−0.13	0.31	−0.09

p-value< 0.05.