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Titolo:
Statistical issues in analyzing 24-hour dietary recall and 24-hour urine collection data for sodium and potassium intakes
Autore:
Espeland, MA; Kumanyika, S; Wilson, AC; Reboussin, DM; Easter, L; Self, M; Robertson, J; Brown, WM; McFarlane, M;
Indirizzi:
Wake Forest Univ, Sch Med, Dept Publ Hlth Sci, Med Ctr,Sect Biostat, Winston Salem, NC 27157 USA Wake Forest Univ Winston Salem NC USA 27157 , Winston Salem, NC 27157 USA Univ London London Sch Hyg & Trop Med, Med Stat Unit, London WC1E 7HT, England Univ London London Sch Hyg & Trop Med London England WC1E 7HT T, England Univ Penn, Ctr Biostat & Epidemiol, Philadelphia, PA USA Univ Penn Philadelphia PA USA Biostat & Epidemiol, Philadelphia, PA USA Univ Illinois, Dept Human Nutr & Dietet, Chicago, IL USA Univ Illinois Chicago IL USA , Dept Human Nutr & Dietet, Chicago, IL USA Univ Med & Dent New Jersey, Robert Wood Johnson Med Sch, Dept Med, New Brunswick, NJ 08903 USA Univ Med & Dent New Jersey New Brunswick NJ USA 08903swick, NJ 08903 USA Wake Forest Univ, Sch Med, Epidemiol Sect, Winston Salem, NC 27157 USA Wake Forest Univ Winston Salem NC USA 27157 , Winston Salem, NC 27157 USA
Titolo Testata:
AMERICAN JOURNAL OF EPIDEMIOLOGY
fascicolo: 10, volume: 153, anno: 2001,
pagine: 996 - 1006
SICI:
0002-9262(20010515)153:10<996:SIIA2D>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
FOOD FREQUENCY QUESTIONNAIRE; BLOOD-PRESSURE; MEASUREMENT ERROR; ELDERLY TONE; HYPERTENSION; EXCRETION; TRIAL; INTERVENTION; RELIABILITY; INTERSALT;
Keywords:
clinical trials; epidemiologic methods; measurement error; nutrition assessment; potassium; sodium;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Espeland, MA Wake Forest Univ, Sch Med, Dept Publ Hlth Sci, Med Ctr,Sect Biostat, Winston Salem, NC 27157 USA Wake Forest Univ Winston Salem NC USA 27157 em, NC 27157 USA
Citazione:
M.A. Espeland et al., "Statistical issues in analyzing 24-hour dietary recall and 24-hour urine collection data for sodium and potassium intakes", AM J EPIDEM, 153(10), 2001, pp. 996-1006

Abstract

Dietary recalls and urine assays provide different metrics for assessing sodium and potassium intakes. Means, variances, and correlations of data obtained from these two modes of measurement differ. Pooling of these data is not straightforward, and results from studies employing the different modesmay not be comparable. To explore differences between these metrics, the authors used data from the Trial of Nonpharmacologic Intervention in the Elderly (TONE), which included repeated standardized 24-hour dietary recalls and 24-hour urine collections administered over 3 years of follow-up, to estimate sodium and potassium intakes. The authors examined data from 341 control participants assigned to usual care that were collected between August 1992 and December 1995. Dietary recalls yielded estimates of sodium intake that averaged 22% less than those from urine assays and estimates of potassium intake that averaged 16% greater than those from urine assays. Sodium intake estimates were less repeatable (r = 0.22 for diet; r = 0.30 for urine) than potassium intake estimates (r= 0.49 for diet; r= 0.50 for urine), making relations with outcomes more difficult to characterize. Overall, the performance of the two measurement modes was fairly similar across demographic subgroups. Errors in separate estimations of long term sodium and potassium intakes using short term data were strongly correlated, more strongly than the underlying long term intakes of these electrolytes. Because of the correlated measurement error, estimated regression coefficients for linear models including both electrolytes as predictors may be confounded such that the separate relations between these nutrients and outcomes such as bloodpressure cannot be reliably estimated by common analytical strategies.

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Documento generato il 30/11/20 alle ore 12:34:20