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Table 1: Characteristics of the control population alongside the study population expressed as mean (SD) or frequency and percentage and level of significance
Study Group (n = 26) Control Group (n = 66) P Value
Mothers’ characteristics
 Maternal age at pregnancy (yr) 32.38 (SD, 5.26) 33.03 (SD, 4.66) .57
 Thyroid disorders 3/26 (11.5%) 4/66 (6%) .40
 Anemia 1/26 (3.8%) 5/66 (7.5%) .67
 Blood clotting disorders 1/26 (3.8%) 7/66 (10.6%) .43
 Hypertension 1/26 (3.8%) 2/66 (3%) 1
 Pregestational diabetes 1/26 (3.8%) 0 .28
Pregnancy characteristics
 Spontaneous conception 21/26 (80%) 57/65^{^a} (88%) .51
 Fetal sex Male 15/26 (57%) Male 32/66 (48%) .43
Female 11/26 (42%) Female 34/66 (52%) 
 GA at MR imaging examination 33.3 (SD, 2.79) 34.1 (SD, 2.58) .20
Neonate characteristics
 Type of birth Vaginal 4/25^{^a} (16%) Vaginal 43/64^{^a} (67%) <.001
  Cesarean 21/25^{^a} (84%) Cesarean 21/64^{^a} (33%) <.001
 Week of birth 35.04 (SD, 2.66) 38.52 (SD, 1.27) <.001
↵a There are some cases in which the data are not documented in our records.