Reference Intervals of Thyroid Hormones and Correlation of BMI with Thyroid Function in Healthy Zhuang Ethnic Pregnant Women
Table 4
β (95% confidence interval) of TSH, FT4, and FT3 among BMI categories.
Trimesters
BMI (kg/m2)
TSH
FT4
FT3
1st
<18.5
-0.052 (-0.188,0.083)
0.165(-0.240,0.570)
-0.064(-0.153,0.026)
18.5-24
Ref.
Ref.
Ref.
≥24
0.185 (0.026,0.345)
-0.325 (-0.804,0.154)
0.145 (0.040,0.251)
p value#
0.014
0.092
≤0.001
2nd
<18.5
0.02 3(-0.137,0.182)
0.368 (-0.090,0.826)
-0.105 (-0.203,-0.008)
18.5-24
Ref.
Ref.
Ref.
≥24
0.012 (-0.071,-0.094)
-0.341 (-0.578,-0.104)
0.132 (0.081,0.182)
p value#
0.813
0.001
≤0.001
3rd
18.5-24
Ref.
Ref.
Ref.
24-28
0.049 (-0.119,0.217)
-0.419 (-0.829,-0.008)
0.097 (-0.002,0.197)
≥28
0.070 (-0.142,0.282)
-1.040 (-1.558,-0.522)
0.062 (-0.064,0.188)
p value#
0.963
≤0.001
0.280
Ref.: reference category. P < 0.05, #p value for trend. P value for trend, ratio, and 95% CI were calculated by multiple liner model, adjusted for residence (rural, urban), age (years), gestational age (weeks), and parity (primipara, multipara).
