The correlation between the thyroid function and urinary iodine/creatinine ratio of pregnant women attending a tertiary hospital in Beijing, China, during different trimesters

Table 3 Subgroup analyses of the correlation between UI/Cr and FT4 levels in different trimesters

Subgroup	First trimester		Second trimester		Third trimester
	r	P	r	P	r	P
Age (years)
< 35	0.142	0.084	0.186	0.023	0.121	0.140
≥ 35	0.231	0.012	0.258	0.005	0.184	0.047
BMI (kg/m²)
< 25	0.137	0.094	0.179	0.029	0.116	0.158
≥ 25	0.224	0.006	0.252	0.002	0.181	0.027
Parity
Nulliparous	0.146	0.075	0.191	0.020	0.125	0.128
Multiparous	0.218	0.007	0.246	0.003	0.177	0.031
Education
High school or below	0.119	0.149	0.162	0.048	0.102	0.213
College or above	0.197	0.016	0.234	0.004	0.165	0.044
Occupation
Employed	0.188	0.021	0.226	0.006	0.158	0.054
Unemployed	0.131	0.110	0.174	0.034	0.113	0.169
Family history
Yes	0.153	0.062	0.198	0.015	0.132	0.107
No	0.171	0.037	0.208	0.011	0.142	0.084

ISSN: 1472-6823