Table 1.
Clinical characteristics and laboratory findings of patients with primary Sjögren's syndrome and healthy controls
| Parameter | pSS | Controls |
| Characteristics | ||
| n | 76 | 28 |
| Sex (male, female) | 3, 73 | 6, 22 |
| Agea (years) | 49.2 ± 13.8 | 51 ± 11.4 |
| Disease durationa (years) | 7.2 ± 4.1 | - |
| Clinical findings | ||
| Conjunctivitis | 26 (34) | None |
| Parotid swelling | 22 (28) | None |
| Arthralgia | 51 (67) | None |
| Myalgia | 17 (22) | None |
| Raynaud's phenomenon | 20 (26) | None |
| Peripheral neuropathy | 11 (14) | None |
| Generalized tendomyopathy | 9 (12) | None |
| Skin involvement | 9 (12) | None |
| Pulmonary involvement | 12 (16) | None |
| Renal involvement | 10 (13) | None |
| Thyroiditis | 12 (16) | None |
| Lymphoma | 3 (4) | None |
| Laboratory findings | ||
| Antinuclear antibodies | 76 (100) | Negative |
| RF (Waaler–Rose test) | 60 (79) | Negative |
| Anti-Ro/SS-A antibodies | 69 (91) | Negative |
| Anti-La/SS-B antibodies | 47 (62) | Negative |
| Hypergammaglobulinemia | 57 (75) | Negative |
| Leukocytopenia | 29 (38) | Negative |
| Anemia | 9 (13) | Negative |
| Thrombopenia | 4 (5) | Negative |
| Low complement C3c | 20 (26) | Negative |
| Low complement C4 | 12 (16) | Negative |
Numbers in parentheses are percentages of the total. pSS, primary Sjögren's syndrome; RF, rheumatoid factor; SS, Sjögren's syndrome. aMean ± SD.