Table 4.

Nomogram analysis of the interaction of the three independent variables regarding the probability of classification of samples as definite primary biliary cirrhosis (PBC or PBC/AID)

	Anti-PDC-E2 IgG avidity <64 %		Anti-PDC-E2 IgG avidity ≥64 %
	Antigenic cellular targets		Antigenic cellular targets
IIF-AMA titer	≤2	≥3	≤2	≥3
Low	20.5 % (9.3–36.5 %)a	66.7 % (9.4–99.1 %)	38.5 % (13.9–68.4 %)	–b
Medium or high	50.0 % (36.1–63.9 %)	83.3 % (35.9–99.6 %)	82.1 % (71.7–89.8 %)	100 % (85.4–100.0 %)

IIF-AMA indirect immunofluorescence for antimitochondria antibodies

^a95 % confidence interval in parentheses

^bNot enough information to perform prevision