Risk of CTD occurrence in ANA-positive patients with primary ITP
| ANA-positive (n=125) n (%) | ANA-negative (n=461) n (%) | Crude HR (95% CI) | |
| CTD | 19/125 (15.20) | 9/461 (1.95) | 8.77 (3.97 to 19.40) |
| SLE | 5/125 (4.00) | 0/461 (0.00) | –* |
| pSS | 2/125 (1.60) | 4/461 (0.87) | 2.09 (0.38 to 11.40) |
| UCTD | 12/125 (9.60) | 4/461 (0.87) | 12.42 (4.00 to 38.53) |
| APS | 0/125 (0.00) | 1/461 (0.22) | 4.34 (0.27 to 69.68) |
*Data were unable to be calculated.
APS, antiphospholipid syndrome; CTD, connective tissue disease; pSS, primary Sjogren's syndrome; UCTD, undifferentiated connective tissue disease.