Medicine and Health Sciences Commons^™

A Theater-Based Approach To Primary Prevention Of Sexual Behavior For Early Adolescents, Jessica B. Janega, David M. Murray, Sherri P. Varnell, Jonathan L. Blitstein, Amanda Birnbaum, Leslie A. Lytle

Department of Public Health Scholarship and Creative Works

This article compares four mixed-model analyses valid for group-randomized trials (GRTs) involving a nested cohort design with a single pretest and posttest. This study makes estimates of intraclass correlations (ICCs) available to investigators planning GRTs addressing dietary outcomes. It also provides formulae demonstrating the potential benefits to the standard error of the intervention effect (σΔ) from adjustments for both fixed and time-varying covariates and correlations over time. These estimates will allow other researchers using these variables to plan their studies by estimating a priori detectable differences and sample size requirements for any of the four analytic options. These methods are …

Assessing Intervention Effects In A School-Based Nutrition Intervention Trial: Which Analytic Model Is Most Powerful?, Jessica B. Janega, David M. Murray, Sherri P. Varnell, Jonathan L. Blitstein, Amanda Birnbaum, Leslie A. Lytle

Department of Public Health Scholarship and Creative Works

This article compares four mixed-model analyses valid for group-randomized trials (GRTs) involving a nested cohort design with a single pretest and posttest. This study makes estimates of intraclass correlations (ICCs) available to investigators planning GRTs addressing dietary outcomes. It also provides formulae demonstrating the potential benefits to the standard error of the intervention effect (σΔ) from adjustments for both fixed and time-varying covariates and correlations over time. These estimates will allow other researchers to use these variables to plan their studies by estimating a priori detectable differences and sample size requirements for any of the four analytic options. These methods …

A Schematic For Focusing On Youth In Investigations Of Community Design And Physical Activity, Kevin J. Krizek, Amanda Birnbaum, David M. Levinson

Department of Public Health Scholarship and Creative Works

This paper provides a first step in addressing special considerations for youth in a relatively new area of physical activity research. After reviewing the urgent need for novel approaches to increasing physical activity, the growing interest in the effects of community design are discussed. Although most discussion on this topic has focused on adults, there are important differences between youth and adults that warrant a special focus on youth and need to be accounted for. This article presents a schematic that accounts for how and where youth spend their time, decomposing the day into time spent in travel and time …

Brighter Noise: Sensory Enhancement Of Perceived Loudness By Concurrent Visual Stimulation, Yoav Arieh, Eric C. Odgaard, Lawrence E. Marks

Department of Psychology Faculty Scholarship and Creative Works

Two experiments investigated the effect of concurrently presented light on the perceived loudness of a low-level burst of white noise. The results suggest two points. First, white noise presented with light tends to be rated as louder than noise presented alone. Second, the enhancement in loudness judgments is resistant to two experimental manipulations: varying the probability that light accompanies sound and shifting from a rating method to a forced choice comparison. Both manipulations were previously shown to eliminate a complementary noise-induced enhancement in ratings of brightness. Whereas noise-induced enhancement of brightness seems to reflect a late-stage decisional process, such as …

Casting Health Messages In Terms Of Responsibility For Dietary Change: Increasing Fruit And Vegetable Consumption, Pamela Williams-Piehota, Ashley R. Cox, Stephanie A. Navarro Silvera, Linda Z. Mowad, Sharon Garcia, Nicole A. Katulak, Peter Salovey

Department of Public Health Scholarship and Creative Works

Objective

To compare the effectiveness of messages emphasizing the importance of either personal or social responsibility for dietary behavior change in increasing fruit and vegetable intake.

Design/Setting

Randomly assigned individually or socially oriented messages were delivered at baseline, 1 week, and 2 and 3 months later. Telephone surveys were conducted at baseline and 1 and 4 months later.

Participants

528 callers to a cancer information hotline who were not meeting the “5 A Day” dietary recommendation.

Interventions

A brief telephone-delivered message and 3 mailings of pamphlets and promotional items encouraging fruit and vegetable intake that emphasized either personal or social …

School-Based Approaches To Affect Adolescents’ Diets: Results From The Teens Study, Leslie A. Lytle, David M. Murray, Cheryl L. Perry, Mary Story, Amanda Birnbaum, Martha Y. Kubik, Sherri Varnell

Department of Public Health Scholarship and Creative Works

This article reports on the outcomes of the Teens Eating for Energy and Nutrition at School (TEENS) study, a 2-year intervention study conducted in 16 middle schools with a goal of increasing students’ intakes of fruits, vegetables, and lower-fat foods. Despite positive interim results for students randomized to intervention schools, the positive effects of the intervention were not seen for the primary outcomes at the end of the 2nd year. Positive effects were seen only for a food choice score (suggesting that the students usually choose lower versus higher fat foods) and not for measures of food intake. Future studies …

Assessing The Most Powerful Analysis Method For School-Based Intervention Studies, Jessica B. Janega, David M. Murray, Sherri P. Varnell, Jonathan L. Blitstein, Amanda Birnbaum, Leslie A. Lytle

Department of Public Health Scholarship and Creative Works

This article compares four mixed-model analyses valid for group-randomized trials (GRTs) involving a nested cohort design with a single pretest and a single posttest, the most common design used in GRTs. This study makes estimates of intraclass correlations (ICCs) available to investigators planning GRTs with alcohol, tobacco, and other drug measures as the outcomes of interest. It also provides formulae demonstrating the potential benefits to the standard error of the intervention effect of both adjustments for fixed and time-varying covariates, as well as correlations over time. These estimates will allow other researchers using these variables to plan their studies by …