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

Table 2 Regression analyses demonstrating the relationships between urinary perchlorate concentration and other potential confounding variables on serum FT4 and TSH (n = 308)

	β	SE	95% CI for β	t	p
Factors associated with serum FT4
Urinary perchlorate^a	−0.291	0.114	(− 0.515, − 0.066)	−2.55	0.01
Urinary iodine^a	0.156	0.124	(−0.088, 0.401)	1.27	0.21
Urinary thiocyanate^a	0.196	0.127	(−0.053, 0.446)	1.55	0.12
TPO antibody positive	−0.345	0.413	(−1.156, 0.467)	−0.84	0.4
Factors associated with serum TSH^a
Urinary perchlorate^a	0.008	0.032	(−0.056, 0.071)	0.24	0.8
Urinary iodine^a	−0.03	0.035	(−0.10, 0.039)	−0.85	0.4
Urinary thiocyanate^a	−0.047	0.036	(−0.117, 0.24)	−1.31	0.2
TPO antibody positive	0.248	0.117	(0.02, 0.48)	2.126	0.03

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

ISSN: 1756-6614