Table 2.

Laboratory Measurements and Comparison of Distribution by Region

	All (n = 376)	CA (n = 125)	MA (n = 126)	OH/IL (n = 125)	Comparison (p-value)
	Median (range)
Urinary iodine concentration (μg/L)	143 (6–2140)	159 (16.9–720)	131 (10.6–595)	154 (6–2140)	0.18
Urinary perchlorate concentration (μg/L)	3.1 (0.2–94.5)	2.8 (0.2–94.5)	3.2 (0.2–22.4)	3.5 (0.2–31.7)	0.70
Urinary thiocyanate concentration (μg/L)	514 (12.3–4250)	565 (43.2–2020)	450.8 (31.1–2755)	525.5 (12.3–4250)	0.16
	N (%)
UIC <100 μg/L	125 (33%)	37 (30%)	44 (35%)	44 (35%)	0.54

UIC, urinary iodine concentration.