. Author manuscript; available in PMC: 2014 Oct 1.

Published in final edited form as: Br J Haematol. 2013 Jul 20;163(1):112–117. doi: 10.1111/bjh.12481

Table II.

Relationships between spirometry, lung volumes and respiratory muscle force

	% Predicted MIP		% Predicted MEP
Measure	Correlation (r)	P-value	Correlation (r)	P-value
Spirometry
FVC (% predicted)	0.52	*0.002*	0.43	*0.011*
FEV₁ (% predicted)	0.44	*0.008*	0.22	0.211
FEV₁/FVC (%)	-0.10	0.573	-0.30	0.085
FEF_25-75 (% predicted)	0.09	0.613	-0.04	0.822
Lung Volumes
TLC (% predicted)	0.54	*0.001*	0.42	*0.013*
RV (% predicted)	0.09	0.613	0.12	0.499
RV/TLC (%)	0.01	0.955	0.10	0.573
Respiratory muscle force
MIP (% predicted)	-----	-----	0.64	*<0.0001*

MIP, maximal inspiratory pressure; MEP, maximal expiratory pressure; FVC, forced vital capacity; FEV₁, forced expiratory volume in 1 s; FEF_25-75, forced expiratory flow between 25% and 75% of FVC; TLC, total lung capacity; RV, reserve volume.