Demographic and clinical features of patients with pSS and controls. Values are n (%) unless otherwise specified.
| Characteristics | pSS, n = 114 | pSS, Matched for Age and Sex with SLE, n = 90 | SLE, n = 34 |
|---|---|---|---|
| Female | 110 (96.4) | 89 (98.8) | 33 (97.0) |
| Age, yrs, mean ± SD | 51 ± 12.4 | 46 ± 10.9 | 42 ± 13.5 |
| Arthralgia | 110 (96) | 85 (94.4) | 33 (97.0) |
| Family history of hand OA | 27 (25) | 20 (22) | 8 (24) |
| BMI 3 25 | 31 (28) | 22 (24) | 9 (27) |
| Arthritis | 2 (1.75) | 2 (2.2) | 20 (58.8) |
| CRP, mg/dl, mean ± SD | 5.38 ± 1.86 | 4.48 ± 0.98 | 5.54 ± 1.02 |
| RF | 33 (28.9) | 30 (33.3) | 3 (8.8) |
| Anti-CCP | 3 (2.6) | 3 (3.3) | 2 (5.8) |
| ANA | 75 (65.7) | 69 (76.6) | 33 (97.0) |
| Anti-SSA | 63 (55.2) | 60 (66.6) | 0 |
| Anti-SSB | 32 (28.0) | 31 (34.4) | 0 |
| Minor salivary gland biopsy+ | 81 of 88 (92) | 69 (76.6) | 0 |
pSS: primary Sjögren syndrome; SLE: systemic lupus erythematosus; OA: osteoarthritis; BMI: body mass index; CRP: C-reactive protein; RF: rheumatoid factor; anti-CCP: anticyclic citrullinated peptide antibodies; ANA: antinuclear antibody.