Table 2.

Concentrations of thyroid markers according to GDM status in three trimesters.

Variables	Combined	Non-GDM	GDM	P
First trimester
T3	2.35 (1.54, 3.53)	2.33 (2.01, 2.68)	2.50 (2.14, 2.84)	<0.001
fT4	16.7 (12.6, 23.5)	16.7 (15.4, 18.4)	16.7 (15.1, 18.0)	0.09
T3/fT4	139 (86, 221)	137 (117, 162)	148 (125, 175)	<0.001
TSH	1.58 (0.02, 5.59)	1.58 (0.87, 2.54)	1.58 (0.95, 2.39)	0.87
Second trimester
T3	2.56 (1.76, 3.56)	2.53 (2.26, 2.84)	2.78 (2.46, 3.15)	<0.001
fT4	11.9 (9.1, 15.3)	12.0 (11.0, 13.0)	11.5 (10.5, 12.5)	<0.001
T3/fT4	214 (142, 328)	211 (184, 243)	240 (209, 276)	<0.001
TSH	2.42 (0.70, 5.89)	2.46 (1.74, 3.35)	2.13 (1.56, 3.02)	<0.001
Third trimester
T3	2.69 (1.68, 3.75)	2.68 (2.30, 3.05)	2.82 (2.46, 3.20)	<0.001
fT4	13.3 (9.5, 17.2)	13.3 (11.9, 14.8)	13.2 (11.8, 14.4)	<0.24
T3/fT4	202 (128, 303)	199 (172, 233)	214 (185, 248)	<0.001
TSH	2.21 (0.51, 5.57)	2.21 (1.55, 3.08)	2.19 (1.51, 2.98)	0.21

Combined samples are presented as median (2.5th and 97.5th percentile). GDM and non-GDM groups are presented as median (25th and 75th percentile). Unit of T3, fT4 and TSH was nmol/L, pmol/L and μIU/mL. Boldface indicates statistically significant.