Possible Effects of Perchlorate Contamination of Drinking Water on Thyroid Health

Table 1

Demographic characteristics of the study population.

Characteristic		Contaminated area n (%)	Control area n (%)
Gender distribution	Males	138 (50.7)	135 (50)
	Females	134 (49.3)	135 (50)
Age distribution (years)	0–20	79 (29)	85 (31.4)
	21–40	82 (30.1)	76 (28.1)
	41–60	70 (25.7)	84 (31.1)
	61–80	41 (15.1)	25 (9.3)