Key result
Calibration equations using food records or recalls explained 45% to 50% of the variation in 24-hour urine assessments for sodium and 60% to 70% for potassium.
Observational
Calibration equations using 24-hour urinary excretion can correct measurement errors in self-reported sodium and potassium intake, improving the reliability of epidemiological studies on cardiovascular disease risk.
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Supports calibration of self-reported intakes to reduce error in diet-CVD epidemiology; leaves open effects on risk associations.
Huang et al. (2013) conducted an observational in Postmenopausal women. Calibration equations for dietary self-report data vs. Uncorrected dietary self-reports was evaluated on Variation in log-transformed 24-hour urine assessments explained by calibration equations. Calibration equations using food records or recalls explained 45% to 50% of the variation in 24-hour urine assessments for sodium and 60% to 70% for potassium.