Effect of perchlorate and thiocyanate exposure on thyroid function of pregnant women from South-West England: a cohort study

Table 3 Regression analyses demonstrating the relationships between urinary perchlorate concentration and other potential confounding variables on serum FT4 and TSH in a subgroup of women with UIC < 100 μg/l (n = 174)

	β	SE	95% CI for β	t	p
Factors associated with serum FT4
Urinary perchlorate^a	−0.33	0.166	(−0.655, 0.001)	−1.97	0.05
Urinary iodine^a	0.153	0.308	(−0.455, 0.762)	0.50	0.6
Urinary thiocyanate^a	0.184	0.170	(−0.151, 0.520)	1.09	0.3
TPO-Ab positive	−0.316	0.512	(−1.328, 0.70)	−0.616	0.54
Factors associated with serum TSH^a
Urinary perchlorate^a	0.04	0.043	(−0.046, 0.125)	0.91	0.4
Urinary iodine^a	−0.06	0.081	(−0.214, 0.104)	−0.68	0.5
Urinary thiocyanate^a	−0.044	0.044	(−0.131, 0.044)	−0.98	0.3
TPO-Ab positive	0.257	0.134	(−0.01, 0.52)	1.92	0.06

^aDenotes variable transformed using natural logs (allowing â coefficients to be interpreted in terms of percentage change)
Bold value is significant result in the table

ISSN: 1756-6614