Table 3.

Correlation between IVC (L) and other functional markers

Demographic and functional parameters	IVC (L)
Gender	−0.6
Grip strength	0.6
IVC%	0.57
FVC	0.51
Chest wall expansion	0.48
BODE-index	−0.39
Stage of COPD	−0.36
FEV1	0.35
Breath holding time	0.35
6MWD	0.34
Alternative Scale	−0.34
mMRC	−0.26
CAT	−0.16
BMI	0.05

Abbreviations: 6MWD, 6-minute walking distance; BMI, body mass index; BODE-index, Body mass index, airflow Obstruction, Dyspnea and Exercise capacity; CAT, COPD Assessment Test; FEV₁, forced expiratory volume in the first second; FVC, forced vital capacity; IVC, inspiratory vital capacity; mMRC, modified Medical Research Dyspnea Scale.