Urinary Excretion of Sodium, Potassium, and Chloride, but Not Iodine, Varies by Timing of Collection in a 24-Hour Calibration Study

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dc.contributor.author Wang, Chia-Yih
dc.contributor.author Cogswell, Mary
dc.contributor.author Carriquiry, Alicia
dc.contributor.author Loria, Catherine
dc.contributor.author Chen, Te-Ching
dc.contributor.author Pfeiffer, Christine
dc.contributor.author Swanson, Christine
dc.contributor.author Caldwell, Kathleen
dc.contributor.author Perrine, Cria
dc.contributor.author Carriquiry, Alicia
dc.contributor.author Liu, Kiang
dc.contributor.author Sempos, Christopher
dc.contributor.author Gillespie, Cathleen
dc.contributor.author Burt, Vicki
dc.contributor.department Statistics
dc.date 2018-02-17T06:20:14.000
dc.date.accessioned 2020-07-02T06:57:41Z
dc.date.available 2020-07-02T06:57:41Z
dc.date.issued 2013-01-01
dc.description.abstract <p>Because of the logistic complexity, excessive respondent burden, and high cost of conducting 24-h urine collections in a national survey, alternative strategies to monitor sodium intake at the population level need to be evaluated. We conducted a calibration study to assess the ability to characterize sodium intake from timed-spot urine samples calibrated to a 24-h urine collection. In this report, we described the overall design and basic results of the study. Adults aged 18–39 y were recruited to collect urine for a 24-h period, placing each void in a separate container. Four timed-spot specimens (morning, afternoon, evening, and overnight) and the 24-h collection were analyzed for sodium, potassium, chloride, creatinine, and iodine. Of 481 eligible persons, 407 (54% female, 48% black) completed a 24-h urine collection. A subsample (n = 133) collected a second 24-h urine 4–11 d later. Mean sodium excretion was 3.54 6 1.51 g/d for males and 3.09 6 1.26 g/d for females. Sensitivity analysis excluding those who did not meet the expected creatinine excretion criterion showed the same results. Day-to-day variability for sodium, potassium, chloride, and iodine was observed among those collecting two 24-h urine samples (CV = 16–29% for 24-h urine samples and 21–41% for timed-spot specimens). Among all race-gender groups, overnight specimens had larger volumes (P < 0.01) and lower sodium (P < 0.01 to P 5 0.26), potassium (P < 0.01), and chloride (P < 0.01) concentrations compared with other timed-spot urine samples, although the differences were not always significant. Urine creatinine and iodine concentrations did not differ by the timing of collection. The observed day-to-day and diurnal variations in sodium excretion illustrate the importance of accounting for these factors when developing calibration equations from this study.</p>
dc.description.comments <p>This article is from <em>Journal of Nutrition</em> 143 (2013): 1276, doi: <a href="http://dx.doi.org/10.3945/jn.113.175927" target="_blank">10.3945/jn.113.175927</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/stat_las_pubs/29/
dc.identifier.articleid 1029
dc.identifier.contextkey 7854772
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath stat_las_pubs/29
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/90609
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/stat_las_pubs/29/2013_CarriquiryAL_UrinaryExcretionSodium.pdf|||Fri Jan 14 23:13:13 UTC 2022
dc.source.uri 10.3945/jn.113.175927
dc.subject.disciplines Public Health
dc.subject.disciplines Statistics and Probability
dc.subject.disciplines Urology
dc.subject.keywords calibration
dc.subject.keywords circadian rhythm
dc.subject.keywords concentration(parameters)
dc.subject.keywords creatinine urine level
dc.subject.keywords potassium excretion
dc.subject.keywords sodium excretion
dc.subject.keywords sodium intake
dc.subject.keywords urinalysis
dc.subject.keywords urinary excretion
dc.subject.keywords creatinine
dc.subject.keywords nutrition surveys
dc.title Urinary Excretion of Sodium, Potassium, and Chloride, but Not Iodine, Varies by Timing of Collection in a 24-Hour Calibration Study
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 6ddd5891-2ad0-4a93-89e5-8c35c28b0de4
relation.isOrgUnitOfPublication 264904d9-9e66-4169-8e11-034e537ddbca
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