Intraclass Correlations Among Physiologic Measures in Children and Adolescents

Amorim, Leila Denise Alves Ferreira; Bangdiwala, Shrikant I.; McMurray, Robert G.; Creighton, Dana; Harrell, Joanne S.

doi:10.1097/01.nnr.0000289497.91918.94

Cited by 17 publications

(14 citation statements)

References 16 publications

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“…The sample size calculation was based on the primary end point of 12 months and does not assume adequate statistical power for the 24 month assessments. The between group difference of 1 kgm -2 was based on the results from a similar trial [25], using a BMI standard deviation of 1.5 kgm -2 [26] and an intraclass correlation coefficient (ICC) of.01 [27]. Variance estimates were adjusted for clustering as proposed by Murray et al [28].…”

Section: Methodsmentioning

confidence: 99%

The Nutrition and Enjoyable Activity for Teen Girls (NEAT girls) randomized controlled trial for adolescent girls from disadvantaged secondary schools: rationale, study protocol, and baseline results

et al. 2010

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BackgroundChild and adolescent obesity predisposes individuals to an increased risk of morbidity and mortality from a range of lifestyle diseases. Although there is some evidence to suggest that rates of pediatric obesity have leveled off in recent years, this has not been the case among youth from low socioeconomic backgrounds. The purpose of this paper is to report the rationale, study design and baseline findings of a school-based obesity prevention program for low-active adolescent girls from disadvantaged secondary schools.Methods/DesignThe Nutrition and Enjoyable Activity for Teen Girls (NEAT Girls) intervention will be evaluated using a group randomized controlled trial. NEAT Girls is a 12-month multi-component school-based intervention developed in reference to Social Cognitive Theory and includes enhanced school sport sessions, interactive seminars, nutrition workshops, lunch-time physical activity (PA) sessions, PA and nutrition handbooks, parent newsletters, pedometers for self-monitoring and text messaging for social support. The following variables were assessed at baseline and will be completed again at 12- and 24-months: adiposity, objectively measured PA, muscular fitness, time spent in sedentary behaviors, dietary intake, PA and nutrition social-cognitive mediators, physical self-perception and global self-esteem. Statistical analyses will follow intention-to-treat principles and hypothesized mediators of PA and nutrition behavior change will be explored.DiscussionNEAT Girls is an innovative intervention targeting low-active girls using evidence-based behavior change strategies and nutrition and PA messages and has the potential to prevent unhealthy weight gain and reduce the decline in physical activity and poor dietary habits associated with low socio-economic status. Few studies have reported the long-term effects of school-based obesity prevention programs and the current study has the potential to make an important contribution to the field.Trial registrationAustralian New Zealand Clinical Trials Registry No: ACTRN12610000330044

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Section: Methodsmentioning

confidence: 99%

The Nutrition and Enjoyable Activity for Teen Girls (NEAT girls) randomized controlled trial for adolescent girls from disadvantaged secondary schools: rationale, study protocol, and baseline results

et al. 2010

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“…Clustered cross-sectional studies have become increasingly popular in epidemiology, especially when the use of simple random sample designs is not feasible. In such case, the analysis must take into account the degree of similarity between subjects within clusters [ 19 ]. In the present paper we have evaluated methods for estimating adjusted PR in clustered cross-sectional studies using random-effects models.…”

Section: Introductionmentioning

confidence: 99%

Estimating adjusted prevalence ratio in clustered cross-sectional epidemiological data

Santos

Fiaccone

Oliveira

et al. 2008

BMC Med Res Methodol

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Background: Many epidemiologic studies report the odds ratio as a measure of association for cross-sectional studies with common outcomes. In such cases, the prevalence ratios may not be inferred from the estimated odds ratios. This paper overviews the most commonly used procedures to obtain adjusted prevalence ratios and extends the discussion to the analysis of clustered cross-sectional studies.

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“…Power calculations showed a total number of children of 2,778 children in 20 schools are needed to detect a difference of 0.45 kg/m 2 between intervention and control group, assuming a standard deviation of 3.0 kg/m 2 for BMI and an intraclass correlation of 0.01 [ 55 ], with a power of 0.80 en alpha 0.05 (one-sided) and accounting for 10% loss to follow up.…”

Section: Methodsmentioning

confidence: 99%

A school-based intervention to reduce overweight and inactivity in children aged 6–12 years: study design of a randomized controlled trial

et al. 2008

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Background: Effective interventions to prevent overweight and obesity in children are urgently needed especially in inner-city neighbourhoods where prevalence of overweight and inactivity among primary school children is high. A school based intervention was developed aiming at the reduction of overweight and inactivity in these children by addressing both behavioural and environmental determinants.

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Intraclass Correlations Among Physiologic Measures in Children and Adolescents

Cited by 17 publications

References 16 publications

The Nutrition and Enjoyable Activity for Teen Girls (NEAT girls) randomized controlled trial for adolescent girls from disadvantaged secondary schools: rationale, study protocol, and baseline results

The Nutrition and Enjoyable Activity for Teen Girls (NEAT girls) randomized controlled trial for adolescent girls from disadvantaged secondary schools: rationale, study protocol, and baseline results

Estimating adjusted prevalence ratio in clustered cross-sectional epidemiological data

A school-based intervention to reduce overweight and inactivity in children aged 6–12 years: study design of a randomized controlled trial

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