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Public Health Education and Promotion

2004

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Full-Text Articles in Medicine and Health Sciences

Dietary Carbohydrates And Breast Cancer Risk: A Prospective Study Of The Roles Of Overall Glycemic Index And Glycemic Load, Stephanie A. Navarro Silvera, Meera Jain, Geoffrey R. Howe, Anthony B. Miller, Thomas E. Rohan Dec 2004

Dietary Carbohydrates And Breast Cancer Risk: A Prospective Study Of The Roles Of Overall Glycemic Index And Glycemic Load, Stephanie A. Navarro Silvera, Meera Jain, Geoffrey R. Howe, Anthony B. Miller, Thomas E. Rohan

Department of Public Health Scholarship and Creative Works

We examined breast cancer risk in association with overall glycemic index (GI), glycemic load (GL), and dietary carbohydrate and sugar intake in a prospective cohort of 49,613 Canadian women enrolled in the National Breast Screening Study who completed a self‐administered food frequency questionnaire between 1980 and 1985. Linkages to national mortality and cancer databases yielded data on deaths and cancer incidence, with follow‐up ending between 1998 and 2000. During a mean follow‐up of 16.6 years, we observed 1,461 incident breast cancer cases. GI, GL, total carbohydrate and total sugar intake were not associated with breast cancer risk in the total …


Dietary Carbohydrates And Breast Cancer Risk: A Prospective Study Of The Roles Of Overall Glycemic Index And Glycemic Load, Stephanie A. Navarro Silvera, Meera Jain, Geoffrey R. Howe, Anthony B. Miller, Thomas E. Rohan Dec 2004

Dietary Carbohydrates And Breast Cancer Risk: A Prospective Study Of The Roles Of Overall Glycemic Index And Glycemic Load, Stephanie A. Navarro Silvera, Meera Jain, Geoffrey R. Howe, Anthony B. Miller, Thomas E. Rohan

Department of Public Health Scholarship and Creative Works

We examined breast cancer risk in association with an overall glycemic index (GI), glycemic load (GL), and dietary carbohydrate and sugar intake in a prospective cohort of 49,613 Canadian women enrolled in the National Breast Screening Study who completed a self-administered food frequency questionnaire between 1980 and 1985. Linkages to national mortality and cancer databases yielded data on deaths and cancer incidence, with follow-up ending between 1998 and 2000. During a mean follow-up of 16.6 years, we observed 1,461 incident breast cancer cases. GI, GL, total carbohydrate, and total sugar intake were not associated with breast cancer risk in the …


Book Review 2 Optimize Your Life! The One-Page Strategic Planner By Bernhoff A. Dahl, M.D., William C. Mcpeck Dec 2004

Book Review 2 Optimize Your Life! The One-Page Strategic Planner By Bernhoff A. Dahl, M.D., William C. Mcpeck

William C. McPeck

This is my personal review of Optimize Your Life! The One-page Strategic Planner by Bernhoff A. Dahl and published by Wind-Breaker Press in 2003.


Metal Fabrication Shop Owner Dies When Crushed By Falling Steel Plate, Kentucky Injury Prevention And Research Center Dec 2004

Metal Fabrication Shop Owner Dies When Crushed By Falling Steel Plate, Kentucky Injury Prevention And Research Center

Fatality Case Reports--Other

On December 15, 2003, a metal fabrication shop owner died when a 4,000 pound steel base plate fell on him. While inside the shop building, the work crew of least three men, including the owner, fabricated a 10’x 20’ steel base plate to be used at a water treatment plant. The base plate was to house or serve as a bas anchor a large water pump. After welding connectors and channel iron beams to one side of the plate, the crew pushed the plate through a bay door with a forktruck to an outside area in back of the shop. …


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 Dec 2004

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 Dec 2004

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 …


Book Review 1 The New Science Of Selling And Persuasion: How Smart Companies And Great Salespeople Sell By William T. Brooks, William C. Mcpeck Nov 2004

Book Review 1 The New Science Of Selling And Persuasion: How Smart Companies And Great Salespeople Sell By William T. Brooks, William C. Mcpeck

William C. McPeck

This is my personal review of The New Science of Selling and Persuasion: How Smart Companies and Great Salespeople Sell by William T. Brooks and published by Wiley in 2004.


38 Year-Old Construction Laborer Dies When Trench Walls Collapse, Kentucky Injury Prevention And Research Center Nov 2004

38 Year-Old Construction Laborer Dies When Trench Walls Collapse, Kentucky Injury Prevention And Research Center

Fatality Case Reports--Other

On November 3, 2003, a 38-year-old male construction laborer died when the unprotected 8-foot high walls of the trench he was working in collapsed. The decedent was working for a subcontractor who was contracted by a construction company to remove old gas, storm and sanitary sewer lines and install similar new lines. The old abandoned 6-inch diameter gas line was a high pressure, 300 – 320 psi gas line in 10-inch steel casing and was 600 feet long. There were five employees at the job site employed by the subcontractor; a foreman who was a certified competent person, a lab …


Laborer Dies When Caught In Arms Of A Skidsteer Loader, Kentucky Injury Prevention And Research Center Nov 2004

Laborer Dies When Caught In Arms Of A Skidsteer Loader, Kentucky Injury Prevention And Research Center

Fatality Case Reports--Other

On September 19, 2003, a 23-year-old male laborer (decedent) died when he became caught in the activated arms of a skidsteer loader. A work crew consisting of a contractor and 3 laborers had spent the day installing fence on a dairy farm. Earlier in the day, the contractor had borrowed a skidsteer from the farm owner. The work crew used the skidsteer to set fence posts in the ground. At the end of the work day (approximately 4:00 PM), the contractor instructed the decedent to return the skidsteer to the barn area. From the work site, the decedent drove the …


A Study Of Pediatric Heart Transplant Patients In Relationship To Post Transplant Coronary Artery Disease, Mark Randall Nov 2004

A Study Of Pediatric Heart Transplant Patients In Relationship To Post Transplant Coronary Artery Disease, Mark Randall

Loma Linda University Electronic Theses, Dissertations & Projects

Post transplant coronary artery disease influences short and long-term survival of pediatric heart transplant recipients. Associated cardiovascular disease risk factors among non-heart transplant adult and pediatric heart populations for development of coronary artery disease have been documented. Little is known about these typical cardiovascular disease risk factors as well as other possible risk factors in the development of post transplant coronary artery disease. Objective: The purpose of this research was to examine children/adolescents (n=194), 5-18 years old, at least one-year post heart transplant. This study also investigated if there were physiological and psychological/behavioral differences between recipients with (n = 28) …


Licensed Electrician Dies When Electrocuted By 480volts, Kentucky Injury Prevention And Research Center Oct 2004

Licensed Electrician Dies When Electrocuted By 480volts, Kentucky Injury Prevention And Research Center

Fatality Case Reports--Other

On July 4, 2003, a 36-year-old male lead electrician died after being electrocuted with 480 volts of electricity. A crew of five licensed electricians were working at an automotive supply manufacturing facility running wires to connect service for two air conditioning units (3-phase; 480 volts; 30 amp and 35 amp) and service for a lighting panel (3-phase; 277/480 volts and 200 amps). The manufacturing facility had been shut down for the holiday, and besides a facilities office worker in the facilities main office, the five men were the only workers at the site and had complete control of the facility …


Workers Crushed By Vehicles, Kentucky Injury Prevention And Research Center Oct 2004

Workers Crushed By Vehicles, Kentucky Injury Prevention And Research Center

Kentucky Haz Alerts--Motor Vehicle

To prevent motor vehicle repair injuries:

  • Ensure that vehicles are positively restrained from moving with chocks.
  • Do not place jack stands under potential moving vehicle parts.
  • The space under a jack-suspended vehicle should not be entered unless suitable vehicle support stands are utilized.


Trabajadores Aplastados Por Vehículos, Kentucky Injury Prevention And Research Center Oct 2004

Trabajadores Aplastados Por Vehículos, Kentucky Injury Prevention And Research Center

Kentucky Haz Alerts--Motor Vehicle

Para prevenir lesiones relacionadas con la reparación de automotores:

  1. Asegúrese de que los vehículos estén firmemente inmovilizados con tacos.
  2. No coloque los soportes bajo partes del vehículo que se puedan mover.
  3. No se debe ocupar el espacio entre un vehículo suspendido con gato y el suelo a menos que se haga uso de bases de soporte adecuadas para el mismo.


Cervical Cancer Screening In Rural South Africa: An Analysis Of The Awareness, Attitudes, And Practices Of Women Served By The Masincedane Clinic, Jordan Schneider Oct 2004

Cervical Cancer Screening In Rural South Africa: An Analysis Of The Awareness, Attitudes, And Practices Of Women Served By The Masincedane Clinic, Jordan Schneider

Independent Study Project (ISP) Collection

The aim of this study was to conduct a brief investigation into the awareness, attitudes and practices regarding cervical cancer among women living in Keiskammahoek, a rural area in the Eastern Cape of South Africa. The objectives of this study were to:

• Determine if screening is available within a localized rural community and the methods that are being used.

• Determine if women are coming in for screening, the demographics of these women, and the circumstances that bring them into PHC clinics.

• Investigate the level of knowledge and education about cervical cancer and prevention among women within the …


Assessment Of A Body Composition-Focused Approach To Obesity Treatment, Beverly D. Hall Oct 2004

Assessment Of A Body Composition-Focused Approach To Obesity Treatment, Beverly D. Hall

Loma Linda University Electronic Theses, Dissertations & Projects

Obesity is a significant United States’ public health concern. However, high relapse rates continue to be a problem for obesity treatment programs while the focus remains on weight loss, not body composition change. This study examined whether a clinic-based obesity treatment program, focused on body composition change through resistance training, lead to improved body composition, exercise behaviors, and attitude change from focus on weight loss to body composition change. Improvements in self efficacy, outcome expectations and stages of change were also examined. Forty-eight physician-referred overweight or obese adult women (mean body fat 41%, SD = 6.65%), completed assessments and questionnaires …


Ua61/6 Newsletter Issue 4, Wku Institute For Rural Health Development & Research Oct 2004

Ua61/6 Newsletter Issue 4, Wku Institute For Rural Health Development & Research

WKU Archives Records

Newsletter created by and about the Institute for Rural Health Development & Research. This issue contains:

  • Simpson, Staci. Letter from the Director
  • Institute for Rural Health Development & Research Impact Statement
  • Mobile Health Unit Conference Attended
  • WKU Mobile Health & Wellness Unit
  • Kentucky State Fair Project
  • Health House of Horrors
  • Wilson, Richard. Faculty Presents at American Public Health Association Conference
  • New Interdisciplinary Program: WellWorks
  • Health Fair Event for Migrant Workers Held
  • Local Interventions to Encourage the Enhancement of the Health of the Rural Elderly
  • Jones, Susan. Predicting the Use of Personal Respiratory Protection Among Workers in Swine Confinement Buildings
  • The …


A Schematic For Focusing On Youth In Investigations Of Community Design And Physical Activity, Kevin J. Krizek, Amanda Birnbaum, David M. Levinson Sep 2004

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 …


Pediatric Obesity: Intervention Outcomes, Kristy Anne Kuehfuss Sep 2004

Pediatric Obesity: Intervention Outcomes, Kristy Anne Kuehfuss

Loma Linda University Electronic Theses, Dissertations & Projects

Childhood obesity is a national epidemic with serious medical and psychological implications. Almost one-fourth of children in the United States are overweight. Children do not typically grow out of obesity and without intervention the majority of overweight children become overweight adults. Further, childhood obesity results in numerous chronic medical conditions. Thus, the prevention and treatment of childhood obesity are paramount to the avoidance of resultant physical and psychological risk factors. Loma Linda University’s Growing Fit Program seeks to serve the critical and urgent needs of the ever-increasing population of obese children with a multi-disciplinary approach to pediatric weight management. Evaluating …


Cultural Value Orientations, Attributions, And Breast Cancer Screening Behaviors, Patricia M. Flynn Sep 2004

Cultural Value Orientations, Attributions, And Breast Cancer Screening Behaviors, Patricia M. Flynn

Loma Linda University Electronic Theses, Dissertations & Projects

Discrepancies in breast cancer screening behavior exist among various ethnic groups in the United States (Jacobs & Lauderdale, 2001), with Latino American women reporting particularly low screening rates in comparison to Anglo American women (ACS, 2002). Research indicates that behavior is in part influenced by aspects of culture and relevant psychological processes (Betancourt & Lopez, 1993; Betancourt & Fuentes, 2001). This study was designed to investigate the relations among cultural values, attributional processes, and breast cancer screening behavior among Anglo and Latino women. This study also investigated the influence of acculturation among Latino women in relation to the other study …


Pharmacokinetics Of Once-Daily Amikacin In Healthy Foals And Therapeutic Drug Monitoring In Hospitalized Equine Neonates, Erica Paige Bucki, Steeve Giguère, Margo Macpherson, Rachel E. Davis Sep 2004

Pharmacokinetics Of Once-Daily Amikacin In Healthy Foals And Therapeutic Drug Monitoring In Hospitalized Equine Neonates, Erica Paige Bucki, Steeve Giguère, Margo Macpherson, Rachel E. Davis

Faculty Publications

The objectives of this study were to investigate the pharmacokinetics of once-daily amikacin in healthy neonates, to determine amikacin concentrations in hospitalized foals, and to determine the minimum inhibitory concentrations (MICs) of amikacin against gram-negative isolates from blood cultures in septic foals. Median half-life, clearance, and volume of distribution of amikacin in healthy 2- to 3-day-old foals after administration of an intravenous bolus of amikacin (25 mg/kg) were 5.07 hours (4.86-5.45 hours), 1.82 mL/min/kg (1.35-1.97 mL/min/kg), and 0.785 L/kg (0.638-0.862 L/kg), respectively. Statistically significant (P or = 3 microg/mL between the 2 groups. An initial dose at 25 mg/kg is …


Homicides In The Workplace, Kentucky Injury Prevention And Research Center Aug 2004

Homicides In The Workplace, Kentucky Injury Prevention And Research Center

Kentucky Haz Alerts--Other

To prevent workplace violence:

  • Assessment for workplace violence risks should be done in all workplaces.
  • Workplaces should have policies that clearly delineate that violence is not appropriate during any workplace interaction and violence policies should mirror other workplace policies in terms of strategies for reporting and investigation of incidents, and progressive discipline.
  • A clear and consistent reporting system for workplace violence should be in place and every worker should understand how it works.
  • Safety training should be attended by employers, supervisors, and employees.
  • Policy, training, and employee assistance for domestic violence should be implemented in collaboration with community service providers.


Homicidios En El Lugar De Trabajo, Kentucky Injury Prevention And Research Center Aug 2004

Homicidios En El Lugar De Trabajo, Kentucky Injury Prevention And Research Center

Kentucky Haz Alerts--Other

Para prevenir la violencia ocupacional:

Una valoración de los riesgos de violencia ocupacional deberá ser llevada a cabo en todos los lugares de trabajo.

Los lugares de trabajo deben implementar políticas que aclaren que la violencia no es apropiada durante ninguna interacción laboral; de igual forma las políticas sobre violencia deberán reflejar los procedimientos del lugar de trabajo en términos de estrategias para reportar e investigar los casos y la progresión de la disciplina.

Un sistema de reporte de la violencia laboral claro y consistente deberá ser implementado en el lugar de trabajo, y cada trabajador deberá comprender como funciona. …


Health Education’S New Frontier In Addressing Corporate Influences On Health: An Interview With Nicholas Freudenberg, Nicholas Freudenberg, Ellen Jones, Lori Dorfman Jul 2004

Health Education’S New Frontier In Addressing Corporate Influences On Health: An Interview With Nicholas Freudenberg, Nicholas Freudenberg, Ellen Jones, Lori Dorfman

Publications and Research

Nick Freudenberg is Distinguished Professor of Public Health at Hunter College, City University of New York. For the past 25 years, he has worked with community organizations to develop, implement, and evaluate community interventions to improve the well-being of low-income urban communities. He has also worked for many years in the New York City jail, running programs to improve the transition from jail to the community, and advocating for policy changes related to jail conditions and postrelease drug treatment, health care, and housing. More recently, he has turned his attention to the role of corporate policies and practices on the …


Effects Of A Tailored Follow-Up Intervention On Health Behaviors, Beliefs, And Attitudes, Alissa D. Jacobs, Alice S. Ammerman, Susan T. Ennett, Marci K. Campbell, Katherine W. Tawney, Semra Aytur, Stephen W. Marshall, Julie C. Will, Wayne D. Rosamond Jun 2004

Effects Of A Tailored Follow-Up Intervention On Health Behaviors, Beliefs, And Attitudes, Alissa D. Jacobs, Alice S. Ammerman, Susan T. Ennett, Marci K. Campbell, Katherine W. Tawney, Semra Aytur, Stephen W. Marshall, Julie C. Will, Wayne D. Rosamond

Health Management & Policy

Background: The high rates of relapse that tend to occur after short-term behavioral interventions indicate the need for maintenance programs that promote long-term adherence to new behavior patterns. Computer-tailored health messages that are mailed to participants or given in brief telephone calls offer an innovative and time-efficient alternative to ongoing face-to-face contact with healthcare providers.

Methods: Following a 1-year behavior change program, 22 North Carolina health departments were randomly assigned to a follow-up intervention or control condition. Data were collected from 1999 to 2001 by telephone-administered surveys at preintervention and postintervention for 511 low-income, midlife adult women enrolled …


The Association Of Blood Type On The Five Factors Of Personality In Chinese Adolescents, Kunher Wu Jun 2004

The Association Of Blood Type On The Five Factors Of Personality In Chinese Adolescents, Kunher Wu

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this study was to identify the number of personality factors in Chinese adolescents using the Chinese Revised NEO Personality Inventory (NEO-PI-R) and to determine whether blood type is associated with personality. It is widely accepted by psychologists that the five-factor model can provide an adequate representation of adult personality dimensions, but there is less agreement on the number of factors observable in adolescence. A total of 3,396 11th graders from the city of Kaohsiung, Taiwan completed the Chinese NEO-PI-R. Principle component analysis with varimax rotation showed five factors of personality in these Taiwanese adolescents, which clearly …


Roofing Laborer Dies After 60-Foot Fall, Kentucky Injury Prevention And Research Center May 2004

Roofing Laborer Dies After 60-Foot Fall, Kentucky Injury Prevention And Research Center

Fatality Case Reports--Falls

At 8:00 AM on the morning of October 7, 2003, a 33-year-old laborer, working for a roofing contractor, was removing debris from a commercial building roof when he slipped and fell 60 feet to the sidewalk below. There were 2 other laborers and the contractor at the work site that morning. It was the second work day at this particular job site and the three workers were to finish discarding bags of debris from the roof. The decedent and one of the laborers accessed the roof through the building interior, up a flight of stairs to a five-step ladder which …


Master Plumber Dies When Trench Collapses, Kentucky Injury Prevention And Research Center May 2004

Master Plumber Dies When Trench Collapses, Kentucky Injury Prevention And Research Center

Fatality Case Reports--Other

On July 29, 2003, a 35-year-old, male master plumber died when an unshorn trench collapsed. Two employees from the contracting company were speaking with him at the time from the side of the trench. He had searched and diagnosed a water line leak when the walls of the trench collapsed. The plumber was employed by a plumbing company contracted by a commercial establishment to locate and repair a water leak. He died at the scene from asphyxia due to chest compression.

To prevent future occurrences of similar incidents, the following recommendations have been made:

Recommendation No. 1: Employers should train …


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 May 2004

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 Apr 2004

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 Mar 2004

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 …