Sets of criteria*	Performances
	At the time of diagnosis (diagnostic purpose)		At the time of the study (classification purpose)
	Se	SpE	Se	Spe
mNY	0.45	0.98	0.55	0.97
Amor	0.68	0.97	0.82	0.91
mAmor**	0.72	0.96	0.85	0.91
ESSG	0.63	0.96	0.77	0.89
mESSG**	0.67	0.95	0.81	0.89
ASAS	0.75	0.95	0.86	0.92

*mNY = modified New York; **in the mAmor and mESSG criteria, the item sacroiliitis was defined by either X-rays or MRI.