Table 3: Relationship between the results of ANCA testing and clinical diagnoses.

Diseasesp-ANCAc-ANCAx-ANCAIIF (−)/ELISA (+)Anti-MPO (+)Anti-PR3 (+)Total (N)

MPAN45466461061
%73.86.69.89.875.416.4

WGN6341544046
%13.073.92.210.98.787

CSSN4020606
%66.70.033.30.01000.0

CTDN97231291132
%73.51.523.51.56.80.7

GDN671040018117
%57.38.534.20.017.97.7

Other vasculitidesN2711107339
%69.22.628.20.05.60.0

InfectionsN2311202036
%63.92.833.30.05.60.0

NDN231900033
%69.73.027.30.00.00.0

MalignanciesN211901031
%67.73.329.00.03.30.0

RDN180402022
%81.80.018.20.09.00.0

MedicationN100500015
%66.70.033.30.00.00.0

Miscellaneous disordersN52610114
%35.714.342.97.10.07.1

Undefined diagnosisN63439323109
%57.83.735.82.71.82.7

MPA: microscopic polyangiitis, WG: Wegener’s granulomatosis, CSS: Churg-Strauss syndrome, CTD: connective tissue diseases, GD: gastrointestinal diseases, ND: neurological diseases, RD: renal diseases.