Table 2.

Comparisons between urinary iodine concentration (UIC; n 86)^* and thyroid hormones (n 71)^† in the first and third trimesters in women from the state of Rio de Janeiro, Brazil, September 2014–February 2017

	First trimester		Third trimester
	Mean	sd	Mean	sd	P ‡
UIC (µg/l)	231·6	100·8	245·8	108·9	0·324
TSH (mIU/l)	1·08	0·67	1·67	0·86	<0·001
FT4 (ng/dl)	1·18	0·16	0·88	0·12	<0·001

TSH, thyrotropin; FT4, free thyroxine.

^*After excluding patients under iodine supplementation.

^†After excluding patients on levothyroxine use.

^‡Wilcoxon test (paired analysis).