Diagnostic reliability of magnetic resonance imaging for central nervous system syndromes in systemic lupus erythematosus: a prospective cohort study

Table 3 MRI as a diagnostic tool for CNS lupus in 191 patients with SLE

	MRI positive	MRI negative	Relative risk (95% CI)	p	PPV	NPV
CNS Group	25 (44%)	32 (56%)	1.7 (1.1 - 2.7)	0.016	0.424	0.758
Neurologic disorders	17 (50%)	17 (50%)	2.3 (1.3 - 4.1)	0.007	0.333	0.855
Psychiatric disorders	16 (44%)	20 (56%)	1.9 (1.1 - 3.4)	0.038	0.320	0.833
Non-CNS Group	34 (25%)	100 (75%)	-	-	-	-

*An MRI test was defined to be 'positive' when any abnormal intensity lesion was found.
†P values were determined by Fisher's exact test and CNS group or its subgroup is compared with non-CNS group.
CI: Confidence Interval; PPV: positive predictive value; NPV: negative predictive value

ISSN: 1471-2474