Intracluster correlation coefficient in a college-based cluster randomised controlled trial

INTRODUCTION: Most of the public health research is conducted at the population level. More study has utilized cluster design in which a group unit is randomized instead of individuals to avoid contamination effect and more practical. However, not many studies publish their Intracluster correlation...

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Main Authors:	Zainal Abidin, Muhammad 'Adil, Kadir@Shahar, Hayati, Abd Manaf, Rosliza
Format:	Article
Language:	English
Published:	Malaysian Medical Association 2019
Subjects:	RA0421 Public health. Hygiene. Preventive Medicine
Online Access:	http://irep.iium.edu.my/79332/ http://irep.iium.edu.my/79332/ http://irep.iium.edu.my/79332/1/79332_Intracluster%20Correlation%20Coefficient.pdf

id	iium-79332
recordtype	eprints
spelling	iium-793322020-03-11T08:58:11Z http://irep.iium.edu.my/79332/ Intracluster correlation coefficient in a college-based cluster randomised controlled trial Zainal Abidin, Muhammad 'Adil Kadir@Shahar, Hayati Abd Manaf, Rosliza RA0421 Public health. Hygiene. Preventive Medicine INTRODUCTION: Most of the public health research is conducted at the population level. More study has utilized cluster design in which a group unit is randomized instead of individuals to avoid contamination effect and more practical. However, not many studies publish their Intracluster correlation coefficient (ICC) which is the measure of the relatedness of clustered data. It is important to report the ICC that can be used to calculate effective sample size in future cluster study. Here, we aim to report the ICC from a smoking intervention among young adult. METHODS: Based on a college-based quit smoking intervention, a single level model – student nested within colleges was used. There are 10 cluster which is the community college and 16 smokers within each college. The Intracluster correlation coefficients were measured for three outcomes namely motivation to quit smoking, number of cigarette smoke per day and number of quit attempts. The ICC was measured in R studio using ICCbin package. For the binary outcome ICC was measured using variance components from the ANOVA method and Smith confidence limit equation. RESULTS: For the proportion of motivation to quit smoking, the ρ (rho) was 0.026 (95%CI: 0.00, 0.11), mean number of quit smoking, ρ=0.013 (95%CI: 0.00, 0.08) and mean number of quit attempts, ρ=0.01 (95%CI: 0.00, 0.07). DISCUSSION: The ρ in this study was small and almost similar to other reported study. The researcher must calculate and report the ICC to enable others to use in future research. Malaysian Medical Association 2019-08 Article PeerReviewed application/pdf en http://irep.iium.edu.my/79332/1/79332_Intracluster%20Correlation%20Coefficient.pdf Zainal Abidin, Muhammad 'Adil and Kadir@Shahar, Hayati and Abd Manaf, Rosliza (2019) Intracluster correlation coefficient in a college-based cluster randomised controlled trial. Medical Journal of Malaysia, 74 (S2). p. 101. ISSN 0300-5283 http://www.e-mjm.org/2019/v74s2/pst-89-90.pdf
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	RA0421 Public health. Hygiene. Preventive Medicine
spellingShingle	RA0421 Public health. Hygiene. Preventive Medicine Zainal Abidin, Muhammad 'Adil Kadir@Shahar, Hayati Abd Manaf, Rosliza Intracluster correlation coefficient in a college-based cluster randomised controlled trial
description	INTRODUCTION: Most of the public health research is conducted at the population level. More study has utilized cluster design in which a group unit is randomized instead of individuals to avoid contamination effect and more practical. However, not many studies publish their Intracluster correlation coefficient (ICC) which is the measure of the relatedness of clustered data. It is important to report the ICC that can be used to calculate effective sample size in future cluster study. Here, we aim to report the ICC from a smoking intervention among young adult. METHODS: Based on a college-based quit smoking intervention, a single level model – student nested within colleges was used. There are 10 cluster which is the community college and 16 smokers within each college. The Intracluster correlation coefficients were measured for three outcomes namely motivation to quit smoking, number of cigarette smoke per day and number of quit attempts. The ICC was measured in R studio using ICCbin package. For the binary outcome ICC was measured using variance components from the ANOVA method and Smith confidence limit equation. RESULTS: For the proportion of motivation to quit smoking, the ρ (rho) was 0.026 (95%CI: 0.00, 0.11), mean number of quit smoking, ρ=0.013 (95%CI: 0.00, 0.08) and mean number of quit attempts, ρ=0.01 (95%CI: 0.00, 0.07). DISCUSSION: The ρ in this study was small and almost similar to other reported study. The researcher must calculate and report the ICC to enable others to use in future research.
format	Article
author	Zainal Abidin, Muhammad 'Adil Kadir@Shahar, Hayati Abd Manaf, Rosliza
author_facet	Zainal Abidin, Muhammad 'Adil Kadir@Shahar, Hayati Abd Manaf, Rosliza
author_sort	Zainal Abidin, Muhammad 'Adil
title	Intracluster correlation coefficient in a college-based cluster randomised controlled trial
title_short	Intracluster correlation coefficient in a college-based cluster randomised controlled trial
title_full	Intracluster correlation coefficient in a college-based cluster randomised controlled trial
title_fullStr	Intracluster correlation coefficient in a college-based cluster randomised controlled trial
title_full_unstemmed	Intracluster correlation coefficient in a college-based cluster randomised controlled trial
title_sort	intracluster correlation coefficient in a college-based cluster randomised controlled trial
publisher	Malaysian Medical Association
publishDate	2019
url	http://irep.iium.edu.my/79332/ http://irep.iium.edu.my/79332/ http://irep.iium.edu.my/79332/1/79332_Intracluster%20Correlation%20Coefficient.pdf
first_indexed	2023-09-18T21:51:25Z
last_indexed	2023-09-18T21:51:25Z
_version_	1777413794164637696

Intracluster correlation coefficient in a college-based cluster randomised controlled trial

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