JIA	Juvenile idiopathic arthritis
GM	Gut microbiome
CTRLs	Controls
OTUs	Operational taxonomic units
SPME/GC-MS	Solid phase microextraction/Gas-chromatography-mass spectrometry
1H-NMR	Proton nuclear magnetic resonance spectroscopy
VOCs	Volatile organic compounds
JADAS	Juvenile Arthritis Disease Activity Score
CRP	C- reactive protein level
ESR	Erythrocyte sedimentation rate
NSAIDs	Nonsteroidal anti-inflammatory drugs
MSC	Number of misclassifications
ROC	Receiver operating characteristic
PLS-DA	Partial least squares discriminant analysis
RP	Rank product
CCR	Correct classification rate
DCV	Double cross-validation
ERA	Enthesitis-related arthritis patients
NAFLD	Non-alcoholic fatty liver disease
OPGG	Ospedale Pediatrico Giannina Gaslini
OPBG	Ospedale Pediatrico Bambino Gesù
ILAR	International League Against Rheumatism