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Table 2 Median (5th–95th centile) values of thyroid hormones in pregnant and non-pregnant Sudanese women

From: Trimester-specific thyroid hormone reference ranges in Sudanese women

Variable Non- pregnant Trimester-I Trimester-II Trimester-III P
Mean = 10.8 weeks Mean =21.5 weeks Mean =31.2 weeks
TSH, IU/ml 2.080 (0.776–4.550) 1.164 (0.079–2.177) 1.364 (0.540–2.521) 1.445 (0.588–2.460) Non- Pregnant vs. Pregnant P < 0.001
Trimester-I vs. Trimester-II P = 0.042
Trimester-I vs. Trimester-III P = 0.007
Trimester-II vs. Trimester-III P = 0.482
Free T3, pmol/l 5.176 (4.156–6.095) 4.639 (3.843–6.562) 4.347 (3.425–5.447) 4.132 (3.176–5.164) Non- Pregnant vs. Pregnant P < 0.001
Trimester-I vs. Trimester-II P < 0.001
Trimester-I vs. Trimester-III P < 0.001
Trimester-I vs. Trimester-III P = 0.064
Free T4, pmol/l 16.34 (12.6–19.9) 16.86 (13.02–31.48) 13.51 (11.04–31.07) 12.87 (9.807–23.78) Non- Pregnant vs. Pregnant P < 0.001
Trimester-I vs. Trimester-II P = 0.008
Trimester-I vs. Trimester-III P < 0.001
Trimester-I vs. Trimester-III P =0.078