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U.S. Department of Health and Human Services Office of Disease Prevention and Health Promotion

Reduce exposure to perchlorate — EH‑11 Data Methodology and Measurement

On this page:  About the National Data  |  Methodology  |  History

About the National Data

Data

Data Source:  National Health and Nutrition Examination Survey (NHANES), CDC/NCHS

Baseline: 10.4 micrograms per gram (µg/g) was the concentration level of perchlorate (creatinine corrected) in urine samples at which 95 percent of the population aged 3 years and over was at or below in 2015-16

Target: 8.4 µg/g

Numerator
Concentration level of urinary perchlorate (creatinine corrected) at which 95 percent of the population aged 3 years and over is at or below the measured value.
Target-setting method
Projection
Target-setting method details
Linear trend fitted using ordinary least squares and a projection at the 33 percent prediction interval.
Target-setting method justification
Trend data were evaluated for this objective. Using historical data points, a trend line was fitted using ordinary least squares, and the trend was projected into the next decade. This method was used because three or more comparable data points were available, the projected value was within the range of possible values, and a projection at the 33 percent prediction interval was selected because, based on the trajectory of the decline and its slope, it was expected that this target best fit the predicted decline by 2030.

Methodology

Methodology notes

Urinary perchlorate levels reflect recent exposure.

Reference: CDC Biomonitoring Summary for Perchlorate

https://www.cdc.gov/biomonitoring/Perchlorate_BiomonitoringSummary.html

History

Comparable HP2020 objective
Retained, which includes core objectives that are continuing from Healthy People 2020 with no change in measurement.
Revision History
Revised. 

In 2021 the baseline value was revised from 10.7 ug/g to 10.4 ug/g because of a change in the baseline years and the age range of the population included in the measurement. The same target-setting method was used but the prediction interval (PI) used to set the target was updated from the 25% PI to the 33% PI. The baseline and numerator text was also revised to reflect that these measurements include individuals 3 years of age and older.