In those commercial brands in which at least 10 measurements
were made (n ¼ 12), the range (distance between the maximum
and minimum values) in the iodine concentration varied from
142 mg/L in one of the brands to 244 mg/L in another. For the other
brands with fewer than 10 sample units, the range varied from
23 mg/L in one of the brands to 303 mg/L in another.