Characteristics | Total patients (N = 107) | Matched patients (N = 45) | Matched controls (N = 45) |
---|---|---|---|
Age (years) | 39.6 ± 14.1 | 46.7 ± 15.4 | 45.4 ± 15.9 |
Sex (F:M ratio) | 3.9:1 | 3.1:1 | 3.1:1 |
Ethnicity | |||
Caucasian (%) | 88.9 | 86.9 | 86.9 |
African (%) | 6.7 | 6.5 | 6.5 |
Asian (%) | 2.2 | 3.7 | 3.7 |
American Indian (%) | 2.2 | 2.8 | 2.8 |
ACR total (number of criteria met) | 5.51 ± 1.69 | 5.52 ± 1.69 | |
Antichromatin Ab | 32.7 | 28.9 | |
Anti-dsDNA Ab (Crithidia luciliae test) (%) | 27.1 | 33.3 | |
Anticardiolipin IgG Ab (%) | 38.3 | 28.9 | |
LAC (%) | 13.1 | 11.1 | |
Anti-Smith Ab (%) | 18.7 | 11.1 | |
Anti-RNP Ab (%) | 20.6 | 17.8 | |
Anti-Ro/SSA (Ro52/60 kDa) Ab (%) | 38.3 (21.5/34.6) | 31.1 (17.8/28.9) | |
Anti-La/SSB (anti-Ro60 + anti-La) Ab (%) | 16.8 (15.0) | 15.6 (13.3) | |
CH50 <40 (U/ml) | 51.4 | 55.6 | |
C4 <16 (mg/dl) | 35.5 | 44.4 | |
SLEDAI score | 5.29 ± 4.20 | 5.02 ± 3.26 | |
Renal involvement (%) | 13.1 | 24.4 | |
(BILAG grades A to C) | |||
Mucocutaneous involvement (%) | 68.2 | 57.8 | |
Musculoskeletal involvement (%) | 77.6 | 66.7 | |
Cardiovascular/respiratory involvement (%) | 14 | 15.6 | |
Hematological involvement (%) | 37.4 | 31.1 | |
Vasculitis (%) | 53.3 | 53.3 | |
Neurological involvement (%) | 3.7 | 4.4 | |
BILAG total score | 6.17 ± 4.53 | 5.70 ± 3.93 | |
Gas6 plasma levels (ng/ml) | 18.81 ± 8.67 | 17.64 ± 7.10 | 15.89 ± 6.88 |
Free protein S plasma levels (μg/ml) | 6.78 ± 2.36 | 6.37 ± 1.79 | 6.91 ± 1.74 |