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Table 5 Association between estimated iodine intake from the I-FFQ and thyroid biomarkersa

From: Validation and reproducibility of a new iodine specific food frequency questionnaire for assessing iodine intake in Norwegian pregnant women

  Unadjusted coefficients (95% CI) Adjusted coefficients (95% CI)b
  P R2   P R2
TSH (mIU/L) 22.2 (−3.2, 47.6) 0.087 0.024 12.5 (−12.0, 37.1) 0.312 0.107
fT3 (pmol/L) −11.5 (− 54.2, 31.2) 0.595 0.002 −11.6 (−51.7, 28.5) 0.567 0.101
fT4 (pmol/L) −5.0 (−16.2, 6.3) 0.382 0.006 −5.6 (−16.5, 5.3) 0.314 0.107
  1. fT3, free triiodothyronine; fT4, free thyroxine, TSH, thyroid stimulating hormone
  2. an = 123 for TSH; n = 124 for fT3; n = 122 for fT4
  3. bAdjusted for BMI, age, nicotine use while pregnant and education. Categories for nicotine use: 0 = no, 1 = yes; categories for education 0 ≤ high school, 1 ≥ university/ university college