Urine samples with values above
the standard curve were first diluted at 1 in 5, followed by dilutions of
1 in 10 and 1 in 20, if needed. As a quality-control procedure, triplicate
samples from 2 volunteers were labeled identically to the survey samples
and included in the samples shipped to the laboratory. The CVs for these
triplicates were 1.23% and 0.71%. Population median UICs were used
to categorize population iodine intakes as insufficient (