Intraclass correlation for measures from a middle school nutrition intervention study: Estimates, correlates, and applications

David M. Murray, Glenn A. Phillips, Amanda Birnbaum, Leslie A. Lytle

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

This article presents the first estimates of school-level intraclass correlation for dietary measures based on data from the Teens Eating for Energy and Nutrition at School study. This study involves 3,878 seventh graders from 16 middle schools from Minneapolis - St. Paul, Minnesota. The sample was 66.8% White, 11.2% Black, and 7.0% Asian; 48.8% of the sample was female. Typical fruit and vegetable intake was assessed with a modified version of the Behavior Risk Factor Surveillance System questionnaire. Twenty-four-hour dietary recalls were conducted by nutritionists using the Minnesota Nutrition Data System. Mixed-model regression methods were used to estimate variance components for school and residual error, both before and after adjustment for demographic factors. School-level intraclass correlations were large enough, if ignored, to substantially inflate the Type I error rate in an analysis of treatment effects. The authors show how to use the estimates to determine sample size requirements for future studies.

Original languageEnglish
Pages (from-to)666-679
Number of pages14
JournalHealth Education and Behavior
Volume28
Issue number6
DOIs
StatePublished - 1 Jan 2001

Fingerprint

Behavioral Risk Factor Surveillance System
Nutritionists
Information Systems
Vegetables
Sample Size
Fruit
Eating
Demography
Middle School
Nutrition
Therapeutics
Minneapolis
Risk Factors
Intake
Energy
Apostle Paul
Demographics
Asia
Surveillance
Treatment Effects

Cite this

@article{81f43ff52f554f7a82cba0edd186c524,
title = "Intraclass correlation for measures from a middle school nutrition intervention study: Estimates, correlates, and applications",
abstract = "This article presents the first estimates of school-level intraclass correlation for dietary measures based on data from the Teens Eating for Energy and Nutrition at School study. This study involves 3,878 seventh graders from 16 middle schools from Minneapolis - St. Paul, Minnesota. The sample was 66.8{\%} White, 11.2{\%} Black, and 7.0{\%} Asian; 48.8{\%} of the sample was female. Typical fruit and vegetable intake was assessed with a modified version of the Behavior Risk Factor Surveillance System questionnaire. Twenty-four-hour dietary recalls were conducted by nutritionists using the Minnesota Nutrition Data System. Mixed-model regression methods were used to estimate variance components for school and residual error, both before and after adjustment for demographic factors. School-level intraclass correlations were large enough, if ignored, to substantially inflate the Type I error rate in an analysis of treatment effects. The authors show how to use the estimates to determine sample size requirements for future studies.",
author = "Murray, {David M.} and Phillips, {Glenn A.} and Amanda Birnbaum and Lytle, {Leslie A.}",
year = "2001",
month = "1",
day = "1",
doi = "10.1177/109019810102800602",
language = "English",
volume = "28",
pages = "666--679",
journal = "Health Education and Behavior",
issn = "1090-1981",
publisher = "SAGE Publications Inc.",
number = "6",

}

Intraclass correlation for measures from a middle school nutrition intervention study : Estimates, correlates, and applications. / Murray, David M.; Phillips, Glenn A.; Birnbaum, Amanda; Lytle, Leslie A.

In: Health Education and Behavior, Vol. 28, No. 6, 01.01.2001, p. 666-679.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Intraclass correlation for measures from a middle school nutrition intervention study

T2 - Estimates, correlates, and applications

AU - Murray, David M.

AU - Phillips, Glenn A.

AU - Birnbaum, Amanda

AU - Lytle, Leslie A.

PY - 2001/1/1

Y1 - 2001/1/1

N2 - This article presents the first estimates of school-level intraclass correlation for dietary measures based on data from the Teens Eating for Energy and Nutrition at School study. This study involves 3,878 seventh graders from 16 middle schools from Minneapolis - St. Paul, Minnesota. The sample was 66.8% White, 11.2% Black, and 7.0% Asian; 48.8% of the sample was female. Typical fruit and vegetable intake was assessed with a modified version of the Behavior Risk Factor Surveillance System questionnaire. Twenty-four-hour dietary recalls were conducted by nutritionists using the Minnesota Nutrition Data System. Mixed-model regression methods were used to estimate variance components for school and residual error, both before and after adjustment for demographic factors. School-level intraclass correlations were large enough, if ignored, to substantially inflate the Type I error rate in an analysis of treatment effects. The authors show how to use the estimates to determine sample size requirements for future studies.

AB - This article presents the first estimates of school-level intraclass correlation for dietary measures based on data from the Teens Eating for Energy and Nutrition at School study. This study involves 3,878 seventh graders from 16 middle schools from Minneapolis - St. Paul, Minnesota. The sample was 66.8% White, 11.2% Black, and 7.0% Asian; 48.8% of the sample was female. Typical fruit and vegetable intake was assessed with a modified version of the Behavior Risk Factor Surveillance System questionnaire. Twenty-four-hour dietary recalls were conducted by nutritionists using the Minnesota Nutrition Data System. Mixed-model regression methods were used to estimate variance components for school and residual error, both before and after adjustment for demographic factors. School-level intraclass correlations were large enough, if ignored, to substantially inflate the Type I error rate in an analysis of treatment effects. The authors show how to use the estimates to determine sample size requirements for future studies.

UR - http://www.scopus.com/inward/record.url?scp=0035651010&partnerID=8YFLogxK

U2 - 10.1177/109019810102800602

DO - 10.1177/109019810102800602

M3 - Article

C2 - 11720271

AN - SCOPUS:0035651010

VL - 28

SP - 666

EP - 679

JO - Health Education and Behavior

JF - Health Education and Behavior

SN - 1090-1981

IS - 6

ER -