BMC Pregnancy and Childbirth

Table 3 Multiple regression equation with urinary iodine levels at each trimester as the dependent variables and selected independent variables among study subjects^a

From: Urinary iodine and thyroid determinants in pregnancy: a follow up study in Sri Lanka

Variable	Urinary iodine (T₁)		Urinary iodine (T₃)
Variable	ß	p-value	ß	p-value
Anthropometry
Weight	0.157	0.006	0.090	0.37
Height	−0.033	0.56	0.032	0.60
BMI	0.005	0.96	0.167	0.005
Thyroid volume	−0.031	0.60	0.117	0.03
Thyroid size	−0.081	0.15	0.136	0.02
Demography
Social class	0.074	0.20	−0.010	0.87
Education level	0.019	0.73	−0.008	0.90
Parity	0.062	0.28	−0.123	0.04
Age in years	−0.002	0.97	−0.009	0.89
Period of gestation	−0.082	0.15	0.044	0.45
Biochemical analysis
Serum TSH^b	−0.066	0.25	−0.006	0.92
Serum fT₄ ^b	0.040	0.49	−0.061	0.29
Serum thyroglobulin^c	−0.045	0.62	−0.069	0.51
p (model)	0.006		<0.001
r ²	0.025		0.045

^aAnthropometry and demographic data were collected at study entry (first trimester) were compared with urinary iodine level of first and third trimester
^bThese biochemical parameters were assessed separately first trimester data with first trimester urinary iodine and third trimester data with third trimester urinary iodine respectively
^cSerum thyroglobulin level was measured at study entry and compared with urinary iodine level of first and third trimester

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ISSN: 1471-2393

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