Table 2. Sensitivity, specificity and predictive value of IgG4 in patients with autoimmune pancreatitis (AIP) and controls (non-AIP).

Levels of serum IgG4	AIP (n = 61)	Non-AIP (n = 277)	Total	Predictive value (%)
≥1350 mg/L	48	34	82	Positive 58.5%
<1350 mg/L	13	243	256	Negative 94.9%
Total	61	277	338
	Sensitivity 78.7%	Specificity 87.7%