Baseline characteristics of the study population
| Characteristic | All population | CLIFT– | CLIFT+ | ||
| Non-SLE | SLE | ||||
| New diagnosis | Previously diagnosed | ||||
| n (%) | 222 | 81 (36.5) | 11 (5) | 47 (21.2) | 83 (37.4) |
| Mean age (SD), years | 49.3 (19) | 53.9 (21.2) | 56.1 (21.8) | 47.6 (17) | 44.8 (16.5) |
| Sex, n (%) | |||||
| Women | 188 (84.7) | 69 | 7 | 41 | 71 |
| Men | 34 (15.3) | 12 | 4 | 6 | 12 |
| Ana titter; median (IQR) | 1/320 (1/160- 1/640) | 1/160 (1/80- 1/640) | 1/320 (1/160- 1/640) | 1/160 (1/60-1/320) | 1/640 (1/320- 1/1280) |
| AC-1 pattern; n (%) | 129 (64.2) | 38 (55.9) | 6 (54.5) | 21 (51.2) | 64 (79) |
| dsDNA FEIA, median UI/ml (IQR) | 24 (15.7-50.5) | 18 (13-33) | 21 (15-29) | 26 (15-49) | 34 (19-81) |
| dsDNA FEIA, n (%) | |||||
| 10-15 IU/ml | 55 | 29 (35.8) | 3 (27.3) | 12 (25.5) | 11 (13.3) |
| 16-49 IU/ml | 110 | 40 (49.4) | 6 (54.6) | 25 (53.2) | 39 (46.1) |
| ≥50 IU/ml | 57 | 12 (14.8) | 2 (18.2) | 10 (21.3) | 33 (39.8) |
AC-1, ICAP nomenclature for the homogeneous ANA pattern; CLIFT, Crithidia luciliae indirect immunofluorescence test; dsDNA, double-stranded DNA; FEIA, fluorescence enzyme immunoassay.