High Body Mass Index Is an Indicator of Maternal Hypothyroidism, Hypothyroxinemia, and Thyroid-Peroxidase Antibody Positivity during Early Pregnancy

Table 1

Serum levels of TSH and FT4 in pregnant women^a.

BMI (Kg/m^2)	TSH mIU/L			FT4 pmol/L
	Median	2.5th–97.5th	P value	Median	2.5th–97.5th	value
<18.5	1.85	0.17–5.50		16.52	12.95–22.18
18.5–24.9	1.86	0.27–6.10	0.642	16.10	12.25–21.10	<0.001^b
25.0–29.9	2.11	0.37–6.78	<0.001^b	15.34	11.90–19.68	<0.001^b
≥30.0	2.50	0.56–13.82	0.004^b	14.67	10.25–18.77	<0.001^b

TSH: thyroid stimulating hormone; FT4: free thyroxine.
^aThe value represent the median level of this group compared with the upper group.
was considered as a significant difference.