Possible Effects of Perchlorate Contamination of Drinking Water on Thyroid Health

Table 3

Comparison of mean values of TSH, T4, and TPO antibodies measured among the study participants based on the study area.

Thyroid function	Contaminated area	Control area	value
TSH (mean ± SD)	2.049 ± 1.19	1.907 ± 1.16	0.657
Free T4 (mean ± SD)	1.079 ± 0.138	1.084 ± 0.176	0.696
TPO antibody (median)	0.450	0.605	0.053