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dc.contributor.authorSwanepoel, Bianca
dc.contributor.authorSchutte, Aletta E.
dc.contributor.authorCockeran, Marike
dc.contributor.authorWentzel-Viljoen, Edelweiss
dc.contributor.authorSteyn, Krisela
dc.identifier.citationSwanepoel, B. et al. 2018. Monitoring the South African population’s salt intake: spot urine v. 24 h urine. Public health nutrition, 21(3):480-488. []en_US
dc.identifier.issn1475-2727 (Online)
dc.description.abstractObjective The present study set out to determine whether morning spot urine samples can be used to monitor Na (and K) intake levels in South Africa, instead of the ‘gold standard’ 24 h urine sample. Design Participants collected one 24 h and one spot urine sample for Na and K analysis, after which estimations using three different formulas (Kawasaki, Tanaka and INTERSALT) were calculated. Setting Between 2013 and 2015, urine samples were collected from different population groups in South Africa. Subjects A total of 681 spot and 24 h urine samples were collected from white (n 259), black (n 315) and Indian (n 107) subgroups, mostly women. Results The Kawasaki and the Tanaka formulas showed significantly higher (P≤0·001) estimated Na values than the measured 24 h excretion in the whole population (5677·79 and 4235·05 v. 3279·19 mg/d). The INTERSALT formula did not differ from the measured 24 h excretion for the whole population. The Kawasaki formula seemed to overestimate Na excretion in all subgroups tested and also showed the highest degree of bias (−2242 mg/d, 95 % CI−10 659, 6175) compared with the INTERSALT formula, which had the lowest bias (161 mg/d, 95 % CI−4038, 4360). Conclusions Estimations of Na excretion by the three formulas should be used with caution when reporting on Na intake levels. More research is needed to validate and develop a specific formula for the South African context with its different population groups. The WHO’s recommendation of using 24 h urine collection until more studies are carried out is still supporteden_US
dc.publisherCambridge Univ Pressen_US
dc.subjectSpot urineen_US
dc.subject24h Urineen_US
dc.subjectSouth Africaen_US
dc.titleMonitoring the South African population’s salt intake: spot urine v. 24 h urineen_US
dc.contributor.researchID20546025 - Swanepoel, Bianca
dc.contributor.researchID10922180 - Schutte, Aletta Elisabeth
dc.contributor.researchID21102007 - Cockeran, Marike
dc.contributor.researchID10998497 - Wentzel-Viljoen, Edelweiss

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