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Table 3 Main demographic variables autoantibodies among controls and subjects with undifferentiated connective tissue disease (UCTD), major rheumatic diseases and no criteria for diagnosis

From: The impact of unrecognized autoimmune rheumatic diseases on the incidence of preeclampsia and fetal growth restriction: a longitudinal cohort study

  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)  
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
  N (%) N (%) N (%) N (%)  
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)   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 (<2500 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
  1. SD standard deviation
  2. p values obtained by one-way anova or chi-square test