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An approach to esti...
An approach to estimate between- and within-group correlation coefficients in multicenter studies : plasma carotenoids as biomarkers of intake of fruits and vegetables
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Ferrari, Pietro (författare)
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Al-Delaimy, Wael K (författare)
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Slimani, Nadia (författare)
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Boshuizen, Hendriek C (författare)
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Roddam, Andrew (författare)
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Orfanos, Philippos (författare)
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Skeie, Guri (författare)
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Rodriguez-Barranco, Miguel (författare)
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Thiebaut, Anne (författare)
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- Johansson, Gerd (författare)
- Umeå universitet,Näringsforskning
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Palli, Domenico (författare)
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Boeing, Heiner (författare)
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Overvad, Kim (författare)
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Riboli, Elio (författare)
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(creator_code:org_t)
- 2005-09-15
- 2005
- Engelska.
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Ingår i: American Journal of Epidemiology. - Cary : Oxford University Press. - 0002-9262 .- 1476-6256. ; 162:6, s. 591-598
- Relaterad länk:
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https://academic.oup...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- In a multicenter study, the overall correlation between two variables can be broken down into a within- and a between-group correlation reflecting associations at the individual and aggregate levels, respectively. A random-effects model is used to estimate variance components of nutrition-related variables and the within- and between-group correlation coefficients. Using data from the European Prospective Investigation into Cancer and Nutrition (EPIC), the authors analyzed the association between levels of three plasma carotenoids (alpha-carotene, beta-cryptoxanthin, and lycopene) and dietary intake of three items (total fruits, carrots, and tomatoes), assessed through dietary questionnaire and single 24-hour dietary recall measurements, in a cross-sectional study involving 3,089 subjects from nine European countries. Intraclass correlation coefficients were 0.178 for alpha-carotene, 0.216 for beta-cryptoxanthin, and 0.299 for lycopene. The between-group correlation coefficients were higher than the within-group coefficients for all three carotenoids. For beta-cryptoxanthin and fruit intake, the between-group versus the within-group correlations were 0.78 and 0.26 for the dietary questionnaire and 0.85 and 0.19 for the 24-hour dietary recall. Results indicate that variability of exposure is driven mainly by the individual compared with the aggregate variation and that biomarker levels perform fairly accurately in discriminating population-level consumption of fruits and vegetables.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Hälsovetenskap -- Folkhälsovetenskap, global hälsa, socialmedicin och epidemiologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Health Sciences -- Public Health, Global Health, Social Medicine and Epidemiology (hsv//eng)
Nyckelord
- carotenoids
- diet
- epidemiologic methods
- multicenter studies
- random-effects model
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Ferrari, Pietro
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Al-Delaimy, Wael ...
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Slimani, Nadia
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Boshuizen, Hendr ...
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Roddam, Andrew
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Orfanos, Philipp ...
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visa fler...
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Skeie, Guri
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Rodriguez-Barran ...
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Thiebaut, Anne
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Johansson, Gerd
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Palli, Domenico
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Boeing, Heiner
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Overvad, Kim
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Riboli, Elio
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visa färre...
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- MEDICIN OCH HÄLSOVETENSKAP
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MEDICIN OCH HÄLS ...
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American Journal ...
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Umeå universitet