Table 3: Percent prevalence of subclinical hyperthyroidism and subclinical and clinical hypothyroidism with 95% confidence intervals by gender, age, race/ethnicity, smoking, and iodine sufficiency status for total U.S. population^**. Data from National Health and Nutrition Examination Survey 2007-2012.

Demographic Variable	Subclinical Hyperthyroidism		Clinical Hyperthyroidism		Subclinical Hypothyroidism		Clinical Hypothyroidism
	Percent Prevalence (95% CI)	Statistically Significant Differences	Percent Prevalence (95% CI)	Statistically Significant Differences	Percent Prevalence (95% CI)	Statistically Significant Differences	Percent Prevalence (95% CI)	Statistically Significant Differences
Total	3.1 (2.2-3.9)		0.3 (0.1-0.4)		3.5 (2.4-4.6)		0.2 (0.1-0.4)
Males (M)	2 (1.3-2.7)	M < F (p < 0.01)	0.4 (0-0.7)		3.1 (1.7-4.6)		0.1 (-0.1-0.3)
Females (F)	4 (2.7-5.4)		0.1 (0-0.3)		3.8 (2.4-5.2)		0.3 (0-0.6)
Age: 12-19 Years (A12)	2.6 (1-4.2)		0.1 (-0.1-0.3)		2.5 (0.6-4.4)		0 (0-0)
Age: 20-64 Years (A20)	3 (2-4.1)		0.3 (0-0.5)		3.3 (1.9-4.6)		0.2 (0-0.4)
Age: 65+ Years (A65)	3.5 (1.4-5.7)		0.3 (-0.1-0.7)		5.3 (3-7.5)		0.5 (-0.1-1.1)
Non-Hispanic White (NHW)	3.3 (2-4.6)		0.3 (0-0.5)		4.4 (2.7-6)	NHW < NHB (p < 0.01)	0.2 (0-0.5)	NHW < NHB (p = 0.046)
Non-Hispanic Black (NHB)	3.1 (2.2-4)		0.1 (-0.1-0.3)		0.6 (0-1.2)	NHB < HISP (p < 0.01)	0.1 (-0.1-0.2)
Hispanic (HISP)	2.1 (0.8-3.4)		0.4 (-0.2-0.9)		3.3 (1.6-4.9)		0.4 (-0.1-0.8)
Non smokers (NSM)	3 (1.8-4.1)		0.2 (0-0.4)		3.6 (2.5-4.7)		0.3 (0-0.5)
Smokers (SM)	3.3 (1.7-4.9)		0.3 (-0.1-0.8)		3 (1.2-4.8)		0.1 (0-0.3)
Iodine Deficient (IOD)	3.9 (1.9-5.9)		0.1 (0-0.3)		3.1 (1.5-4.7)		0.4 (0.1-0.7)
Iodine Replete (IOR)	2.6 (1.9-3.4)		0.3 (0-0.6)		3.7 (2.4-5)		0.1 (-0.1-0.4)

^**Excludes pregnant females.