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 | Â | Â | Â | Â |
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 |