Table 2. Rate of errors in E-test compared to broth microdilution method.

Type of oxacillinase	% of VME	% of ME	% of mE	% of EA	% of CA
OXA-23 MBL- positive	0/11 (0%)	5/11 (45.5%)	5/11 (45.5%)	9/11 (81.8%)	6/11 (54.5%)
OXA-23 MBL- negative	0/17 (0%)	0/17 (0%)	5/17 (29.4%)	15/17 (88.2%)	12/17 (70.6%)
OXA-24/40	0/75 (0%)	8/75 (10.7%)	44/75 (58.7%)	71/75 (94.7%)	44/75 (58.7%)
OXA-58	0/15 (0%)	0/15 (0%)	5/15 (33.3%)	14/15 (93.3%)	10/15 (66.7%)
Carbapenemase negative	1/37 (2.7%)	0/37 (0%)	10/37 (27.0%)	32/37 (86.5%)	10/37 (27.0%)

VME = very major error; ME = major error; mE = minor error; EA = essential agreement; CA = categorical agreement