Table 3 Main demographic variables autoantibodies among controls and subjects with undifferentiated connective tissue disease (UCTD), major rheumatic diseases and no criteria for diagnosis
|  | Controls n = 597 | UCTD n = 131 | Major rheumatic diseases n = 68 | No criteria for diagnosis n = 150 | p |
|---|---|---|---|---|---|
mean (SD) | mean (SD) | mean (SD) | mean (SD) | Â | |
Maternal age (years) | 33.2 (4.5) | 33.6 (4.9) | 33.6 (4.9) | 33.5 (4.5) | 0.65 |
Body mass index (Kg\m2) | 23 (3.4) | 22.8 (3.7) | 22.6 (3.1) | 22.7 (3.1) | 0.66 |
Gestational age at entry (weeks) | 13.1 (1.3) | 13 (1.4) | 12.9 (1.2) | 13.2 (1.4) | 0.7 |
Gestational age at birth (weeks) | 39 (1.9) | 38.4 (2.1) | 37.7 (2.9) | 38.9 (1.99) | <.001 |
Birth Weight (gr) | 3242 (506) | 3050 (607) | 2844 (664.77) | 3086 (492) | <.001 |
| Â | N (%) | N (%) | N (%) | N (%) | Â |
Caucasian | 573 (96) | 127 (97) | 64 (94) | 141 (94) | 0.8 |
Black/African | 21 (3.5) | 3 (2.3) | 4 (6) | 8 (5.3) | |
Asian | 3 (0.5) | 1 (0.7) | Â | 1 (0.7) | |
Education (years) | |||||
 ≤8 | 98 (16.4) | 19 (14.5) | 10 (14.7) | 22 (14.7) | 0.9 |
 8–13 | 318 (53.3) | 75 (57.3) | 37 (54.4) | 76 (50.7) | |
 >13 | 181 (30.3) | 37 (28.2) | 21 (30.9) | 52 (34.7) | |
Nulliparous | 417 (69.8) | 80 (61.1) | 39 (57.3) | 96 (64) | <.001 |
First trimester smoking | 83 (13.9) | 26 (19.8) | 14 (20.6) | 30 (20) | 0.1 |
Previous low birth weight infant (<2500Â gm) | 4 (0.67) | 4 (3.1) | 3 (4.4) | 4 (2.6) | 0.03 |
Chronic hypertension | 7 (1.2) | 6 (4.6) | 2 (2.9) | 1 (0.6) | 0.06 |