Emeville, E;
Lassale, C;
Castetbon, K;
Deschamps, V;
Salanave, B;
Vernay, M;
Guergour, D;
... Verdot, C; + view all
(2019)
Estimating sodium intake from spot urine samples at population level: a validation and application study in French adults.
British Journal of Nutrition
, 122
(2)
pp. 186-194.
10.1017/S0007114519000886.
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Abstract
The aim of this study was to assess the validity of the predictive INTERSALT equation using spot urine samples to estimate 24-hour urinary sodium (24-hUNa) excretion and daily sodium intake among the French adult population. Among 193 French adults ("validation sample"), we assessed the validity by comparing predicted 24-hUNa excretion from spot urine and measured 24-hUNa excretion from 24-hour urine collections. Spearman correlation coefficients and Bland-Altman plots were used and we calculated calibration coefficients. In a nationally representative sample of 1,720 French adults ("application sample"), the calibrated predictive equation was then applied to the spot urine Na values to estimate 24-hUNa excretion and daily Na intake. In that sample, predicted Na intake was compared to that estimated from 24-hour dietary recalls. Results were adjusted and corrected using calibration coefficients. In the validation sample, the measured 24-hUNa excretion was on average 14% higher than the predicted 24-hUNa (+ 13% for men and + 16% for women). Correlation between measured and predicted 24-hUNa excretion was moderate (Spearman r = 0.42) and the Bland-Altman plots showed underestimation at lower excretion level and overestimation at higher level. In the application study, estimated daily salt intake was 8.0 g/day using dietary recalls, 8.1 g/day using predicted INTERSALT equation and 9.3 g/day after applying calibration coefficients calculated in the validation study. Despite overall underestimation of 24-hUNa excretion by spot urinary sodium, the use of predictive INTERSALT equation remains an acceptable alternative in monitoring global Na intake/excreted in the French population but its use is not advised at the individual level.
| Type: | Article |
|---|---|
| Title: | Estimating sodium intake from spot urine samples at population level: a validation and application study in French adults |
| Location: | England |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1017/S0007114519000886 |
| Publisher version: | https://doi.org/10.1017/S0007114519000886 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Predictive INTERSALT equation, salt intake, spot urine samples, urinary sodium excretion |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute of Epidemiology and Health UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute of Epidemiology and Health > Epidemiology and Public Health |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10073296 |
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