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Table 1 Characteristics of the study participants

From: Effect of mildly elevated thyroid-stimulating hormone during the first trimester on adverse pregnancy outcomes

Characteristic All women (N = 1858)a
Maternal age (years) 30 (27–34)
Pregestational BMI (kg/m2) 20.03 (18.80–21.51)
TSH (mIU/L), n (%) 1.07 (0.58–1.68)
< 0.1 153 (8.2)
≥0.1 and < 2.5 1532 (82.5)
≥2.5 and < 4.0 142 (7.6)
≥4.0 31 (1.7)
FT4 (pmol/L) 16.52 (14.46–18.73)
  1. aMedian (interquartile range) or n (%)
  2. BMI body mass index, TSH thyroid-stimulating hormone, FT4 free thyroxine 4