Table 4.
Prevalence of thyroid dysfunction in men and women aged 20–50 years who had adequate or excessive drinking water iodine, Hebei Province, People’s Republic of China, 2010
| AIA | EIA | ||||
| % | No. of cases/no. of participants | % | No. of cases/no. of participants | Comparison: AIA v. EIA (Fisher’s exact test, two-tailed probability) | |
| Thyroid dysfunction | 10·3 | 36/312 | 20·6 | 104/506 | P=8·0×10−4 |
| Hypothyroid biology | 1·3 | 4/312 | 3·6 | 18/506 | P=0·073 |
| Subclinical hypothyroid biology | 9·0 | 28/312 | 13·6 | 69/506 | P=0·046 |
| Hyperthyroid biology | 1·3 | 4/312 | 1·2 | 6/506 | P=1·00 |
| Subclinical hyperthyroid biology | 0 | no case | 2·2 | 11/506 | P=8·7×10−3 |
| Thyroid dysfunction in males | 10·7 | 12/112 | 11·9 | 22/185 | P=0·852 |
| Thyroid dysfunction in females | 10·2 | 24/236 | 25·5 | 82/321 | P=3·6×10−6 |
AIA, adequate iodine area; EIA, excessive iodine area.