Table 1. Clinical, laboratory features and results of AAV patients without anti-GBM antibodies.
| Parameters | Number (%) |
| Number | 64 |
| Male/female | 32/32 |
| GPA/MPA | 21/43 |
| Age (years) | 60.48±15.14 |
| Scr (µmol/L) | |
| Mean±SD | 339.11±237.71 |
| Range | 70–1007 |
| Renal insufficiency at diagnosis | 48 (75%) |
| Urinary protein (g/24 hr) | |
| Mean±SD | 2.09±1.83 |
| Range | 0–7.25 |
| ESR | 70.05±40.14 |
| Constitutional symptoms | 49(76.6%) |
| Skin rash | 7 (10.9%) |
| Arthralgia | 15(23.4%) |
| Muscle pain | 10 (15.6%) |
| Hemoptysis | 10(15.6%) |
| Lung involved | 43 (67.2%) |
| ENT | 27(42.2%) |
| Ophthalmic | 14(21.9%) |
| Gastrointestinal | 11(17.2%) |
| Nervous system | 10(15.6%) |
| BVAS | 20.27±5.18 |
| Glomeruli per biopsy | 24.55±11.69 |
| Percentage of normal glomeruli (%) | 28.0±27.0 |
| Glomerular lesions (%) | |
| Total crescents | 60.58±27.19 |
| Cellular crescents | 28.42±25.99 |
| Number of patients’ sera with positive reactivity to recombined linear peptides (GPA/MPA) | |
| P | 4/5 |
| L | 3/8 |
| H1 | 6/16 |
| H2 | 6/11 |
| H3 | 5/4 |
| H4 | 5/8 |
[Abbreviations] GPA: granulomatosis with polyangiitis; MPA: microscopic polyangiitis; BVAS: Birmingham Vasculitis Activity Scores; ENT: ear, nose and throat; SD: standard deviation.