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Table 1 Characteristics of the study population

From: Periconceptional changes in thyroid function: a longitudinal study

  All women Antibody positive women Antibody negative women TSH ≥ 3.0 mIU/liter
Subjects 60 16 44 8
Age (years) a 33 (30-34) 31.5 (30-33) 33 (31-36) 30.5 (30-32)
Ethnicity     
White 52 (86%) 13 (81%) 39 (89%) 7 (88%)
African American 4 (6%) 2 (13%) 2 (5%) 1 (12%)
Asian 4 (6%) 0 (0%) 4 (9%) 0 (0%)
Other 1 (2%) 1 (6%) 0 (0%) 0 (0%)
Preconception TSH (mIU/L) b 1.9 ± 1.9 2.68 ± 2.13 1.63 ± 1.67 3.78 ± 1.24
Preconception Free T4 (ng/dL) c 1.22 ± 0.18 1.18 ± 0.16 1.23 ± 0.18 1.18 ± 0.20
Gestational Age a (weeks) 7.4 (7.0-7.7) 7.3 (6.9-7.6) 7.4 (7.1-7.9) 6.6 (6.4-7.6)
Early pregnancy TSH b (mIU/L) 1.45 ± 2.2 2.13 ± 2.96 1.26 ± 2.00 2.79 ± 1.56
Early pregnancy Free T4 (ng/dL) c 1.23 ± 0.16 1.20 ± 0.16 1.24 ± 0.16 1.22 ± 0.09
  1. a Median (Interquartile range)
  2. b Geometric mean ± standard deviation
  3. c Mean ± standard deviation