Table 3. Prevalence of Hypothyroidism and Hyperthyroidism in Korea according to Age and TPOAb Positivity.

Variable	Overt hypothyroidisma			Subclinical hypothyroidismb			Overt hyperthyroidismc			Subclinical hyperthyroidismd
	Total	Male	Female	Total	Male	Female	Total	Male	Female	Total	Male	Female
Total population, stratified by age, yr
All ages	0.73	0.40	1.10	3.10	2.26	4.04	0.54	0.30	0.81	2.98	2.43	3.59
10–18	0.00	0.00	0.00	3.60	2.40	5.23	0.94	0.63	1.34	1.60	1.41	1.85
19–29	0.20	0.00	0.45	2.34	2.20	2.52	0.25	0.19	0.31	2.26	1.18	3.65
30–39	0.24	0.00	0.54	2.15	1.71	2.68	0.64	0.20	1.17	2.73	1.86	3.78
40–49	0.98	0.23	1.91	2.86	2.09	3.81	0.49	0.22	0.83	2.88	3.05	2.66
50–59	1.44	0.97	1.93	5.09	2.98	7.32	0.78	0.00	1.60	3.57	3.60	3.53
60–69	1.22	1.21	1.22	2.62	2.17	2.98	0.26	0.60	0.00	4.30	3.14	5.20
≥70	0.58	1.13	0.00	2.97	2.41	3.55	0.83	1.63	0.00	3.13	3.75	2.48
Total population, stratified by TPOAb
Positive TPOAb	5.16	5.92	4.81	10.88	9.10	11.69	2.92	2.44	3.13	3.80	4.06	3.67
Negative TPOAb	0.39	0.16	0.66	2.49	1.95	3.13	0.35	0.20	0.54	2.92	2.36	3.58

Values are expressed as percentage. TPOAb positivity was defined as >34.0 IU/mL.

TPOAb, anti-thyroid peroxidase antibody.

^aOvert hypothyroidism was defined thyroid stimulating hormone (TSH) (mlU/L) >97.5th percentile and free thyroxine (fT4) (ng/dL) <0.9; ^bSubclinical hypothyroidism was defined TSH (mlU/L) >97.5th percentile and 0.9≤fT4 (ng/dL)<1.8; ^cOvert hyperthyroidism was defined TSH (mlU/L) <2.5th percentile and fT4 (ng/dL) ≥1.8; ^dOvert hyperthyroidism was defined TSH (mlU/L) <2.5th percentile and 0.9≤fT4 (ng/dL)<1.8.