Table 2. Correlation between lung metabolites and lung function parameters in human participants.

Lung function parameters	Values	Leucine	Glutamic acid	Linoleylcarnitine	Glycine	Propionylcarnitine	Fumaric acid	Malic acid
FVC (%pred)	r	0.496*	0.377	0.227	−0.073	−0.283	−0.356	0.005
	P	0.026	0.101	0.336	0.758	0.227	0.123	0.985
FEV1 (%pred)	r	0.714**	0.650*	0.373	−0.046	−0.445*	−0.589**	−0.371
	P	<0.01	0.02	0.105	0.076	0.049	0.006	0.107
FEV1/FVC (%)	r	0.501*	0.568**	0.331	−0.453*	−0.432	−0.420	−0.477*
	P	0.025	0.009	0.154	0.045	0.057	0.066	0.034
TLC (%pred)	r	−0.619**	−0.373	−0.131	0.302	0.358	0.371	0.451*
	P	0.004	0.106	0.582	0.196	0.121	0.107	0.046
DLCO (%pred)	r	0.648**	0.542*	0.338	−0.438	−0.433	−0.466*	−0.528*
	P	0.002	0.014	0.145	0.054	0.056	0.038	0.017

*, P<0.05; **, P<0.01. FVC (%pred), forced vital capacity percent predicted; FEV₁ (%pred), forced expiratory volume in one second percent predicted; TLC (%pred), total lung capacity percent predicted; DLCO (%pred), diffusing capacity of lung for carbon monoxide percent predicted.