Modeled nitrate levels in well water supplies and prevalence of abnormal thyroid conditions among the Old Order Amish in Pennsylvania

Table 3 Characteristics of the study population by thyroid disease status

	Normal	Subclinical Hyperthyroidism	Clinical Hyperthyroidism	Subclinical Hyperthyroidism	Clinical Hyperthyroidism	Total
Overall (N, %)	2224 (87.5%)	25 (1.0%)	10 0.4%)	228 (9.0%)	56 (2.2%)	2,543
Male (%)	48.6	32.0	30	40.8	41.1	47.5
Age in years (mean)	48.9	56.9	56.2	59.2	56.7	50.1
BMI Males kg/m2 (mean)	26.6	27.2	22.3	26.7	27.5	26.6
BMI Females kg/m2 (mean)	27.5	27.5	27.1	28.5	29.2	29.2
Ever Smoker (%)*	22.3	16.7	33.3	26.5	26.3	22.7

Includes persons who reside in Lancaster, Chester, or Lebanon Counties and excludes persons younger than 18 or who report use of thyroid medications.
*smoking status is based on 45.8% of the study population

ISSN: 1476-069X