Articles
Social Marketing, Stages of Change, and Public Health Smoking Interventions, Health Education Behavior (2011)
As a "thought experiment," the authors used a modified stages of change model for smoking...
Health benefits of increased walking for sedentary, generally healthy older adults: using longitudinal data to approximate an intervention trial, J Gerontol A Biol Sci Med Sci. (2010)
BACKGROUND: Older adults are often advised to walk more, but randomized trials have not conclusively...
Prevalence, incidence, and persistence of major depressive symptoms in the Cardiovascular Health Study (with Stephen M. Thielke MD, MS), Aging and Mental Health (2010)
PURPOSE: To explore the association of major depressive symptoms with advancing age, sex, and self-rated...
Identification of ovarian cancer symptoms in health insurance claims data. (with Sean Devlin), Journal of Women's Health (2010)
Background: Women with ovarian cancer have reported abdominal=pelvic pain, bloating, difficulty eating or feeling full...
Weight, mortality, years of healthy life, and active life expectancy in older adults, Journal of the American Geriatric Society (2007)
OBJECTIVES: To determine whether weight categories predict subsequent mortality and morbidity in older adults. DESIGN:...
The number of sick persons in a cohort, Research on Aging (2007)
To see if the number of sick persons in a cohort was approximately constant over...
Age-specific prevalence and years of healthy life in a system with 3 health states, Statistics in Medicine (2007)
Consider a 3-state system with one absorbing state, such as Healthy, Sick, and Dead. Over...
Quality of life at the end of life (with Bill Lafferty), Health and Quality of Life Outcomes (2007)
Background: Little is known about self-perceived quality of life (QOL) near the end of life,...
The effect of different public health interventions on longevity, morbidity, and years of healthy life, BMC Public Health (2007)
BACKGROUND: Choosing cost-effective strategies for improving the health of the public is difficult because the...
Synchrony of change in depressive symptoms, health status, and quality of life in persons with clinical depression, Healthy Qual Life Outcomes (2006)
BACKGROUND: Little is known about longitudinal associations among measures of depression, mental and physical health,...
Accounting for missing data in end-of-life research (with Laura Lee Johnson), J Palliat Med (2005)
End-of-life studies are likely to have missing data because sicker persons are less likely to...
Methods for incorporating death into health-related variables in longitudinal studies, J Clin Epidemiol (2005)
BACKGROUND AND OBJECTIVES: Longitudinal studies of health over time may be misleading if some people...
Reliability, effect size, and responsiveness of health status measures in the design of randomized and cluster-randomized trials, Contemp Clin Trials (2005)
BACKGROUND: New health status survey instruments are often described by their psychometric (measurement) properties, such...
The relation of dietary patterns to future survival, health, and cardiovascular events in older adults, J Clin Epidemiol (2003)
BACKGROUND: There have been few long-term follow-up studies of older adults who follow different dietary...
Imputation of missing longitudinal data: a comparison of methods (with Jean Mundahl Engels), J Clin Epidemiol (2003)
BACKGROUND AND OBJECTIVES: Missing information is inevitable in longitudinal studies, and can result in biased...
Accounting for deaths in longitudinal studies using the SF-36: the performance of the Physical Component Scale of the Short Form 36-Item Health Survey and the PCTD, Med Care (2003)
BACKGROUND: Commonly used measures such as the Physical Component Scale of the Short Form 36-item...
Trajectories of health for older adults over time: accounting fully for death, Ann Intern Med (2003)
The process of healthy aging can best be described by plotting the trajectory of health-related...
The aging and dying processes and the health of older adults, J Clin Epidemiol (2002)
It is difficult to distinguish changes in health due to aging from those related to...
The importance of the normality assumption in large public health data sets (with Thomas Lumley), Annu Rev Public Health (2002)
It is widely but incorrectly believed that the t-test and linear regression are valid only...
Weight-modification trials in older adults: what should the outcome measure be?, Curr Control Trials Cardiovasc Med (2002)
BACKGROUND: Overweight older adults are often counseled to lose weight, even though there is little...
Transforming self-rated health and the SF-36 scales to include death and improve interpretability, Med Care (2001)
BACKGROUND: Most measures of health-related quality of life are undefined for people who die. Longitudinal...
Patterns of self-rated health in older adults before and after sentinel events, J Am Geriatr Soc (2001)
OBJECTIVES: To describe and compare patterns of change in self-rated health for older adults before...
Probabilities of transition among health states for older adults, Qual Life Res (2001)
GOAL: To estimate the probabilities of transition among self-rated health states for older adults, and...
Measuring the "managedness" and covered benefits of health plans (with David Grembowski), Health Serv Res (2000)
STUDY AIMS: (1) To develop indexes measuring the degree of managedness and the covered benefits...
Survival versus years of healthy life; which is more powerful as a study outcome?, Control Clin Trials (1999)
Studies of interventions that are intended to improve patients' health are often evaluated with survival...
Methods for analyzing health care utilization and costs, Annu Rev Public Health (1999)
Important questions about health care are often addressed by studying health care utilization. Utilization data...
Body mass index and mortality in nonsmoking older adults: the Cardiovascular Health Study, Am J Public Health (1998)
OBJECTIVES: This study assesses the relationship of body mass index to 5-year mortality in a...
Predicting future years of healthy life for older adults, J Clin Epidemiol (1998)
Cost-effectiveness studies often need to compare the cost of a program to the lifetime benefits...
Effect size and power for clinical trials using years of healthy life as the primary endpoint, Stat Med (1997)
Some clinical trials perform repeated measurements on patients over time, plot those measures against time,...
Will unininsured people volunteer for voluntary health insurance? Experience from Washington State, American Journal of Public Health (1996)
OBJECTIVES: In national and local discussions of health care reform, there is disagreement about whether...
Optimal survey design for community intervention evaluations: cohort or cross-sectional?, J Clin Epidemiol (1995)
Community intervention evaluations that measure changes over time may conduct repeated cross-sectional surveys, follow a...
Breaking the matches in a paired t-test for community interventions when the number of pairs is small, Stat Med (1995)
There is considerable interest in community interventions for health promotion, where the community is the...
Including deaths when measuring health status over time, Med Care (1995)
Measuring health status over time is problematic when some subjects die, because death does not...
Who enrolled in a state program for the uninsured: was there adverse selection?, Med Care (1993)
Managed care plans may hesitate to participate in programs for uninsured persons because they fear...
Do communities differ in health behaviors?, J Clin Epidemiol (1993)
Communities differ in the prevalence of various health behaviors, but it is not known to...
Small area variation analysis. Methods for comparing several diagnosis-related groups., Med Care (1993)
In small-area variation analysis, the variation of health care utilization rates, e.g., admission rates, among...
Assessing response bias in random-digit dialling surveys: the telephone-prefix method, Stat Med (1992)
Knowledge of the characteristics of survey non-respondents is important to determine generalizability to the population...
Can small-area analysis detect variation in surgery rates? The power of small-area variation analysis., Med Care (1992)
A variety of statistical methods can be used in small-area analysis to test whether there...
Testing the null hypothesis in small area analysis (with Kevin Cain), Health Services Research (1992)
The goal of small area analysis is often to demonstrate that hospital admission rates or...
Reproducibility and responsiveness of health status measures. Statistics and strategies for evaluation (with Richard Deyo), Control Clin Trials (1991)
Before being introduced to wide use, health status instruments should be evaluated for reliability and...
Estimating county percentages of people without health insurance, Inquiry (1991)
County data on the percentage of people without health insurance are seldom available, although state...
A small area simulation approach to determining variation in dental procedure rates, Am J Public Health (1990)
All small area analyses need to compare the observed variability in rates to that expected...
Use of a preferred provider plan by employees of the City of Seattle, Med Care (1990)
Little is known about the use of services in a preferred provider organization (PPO). We...
What is too much variation? The null hypothesis in small-area analysis, Health Serv Res (1990)
A small-area analysis (SAA) in health services research often calculates surgery rates for several small...
Treatment modality and quality differences for black and white breast cancer patients treated in community hospitals, Med Care (1989)
This study assessed the relationship of race and patterns of care, defined by an expert...
Prediction of fracture in patients with acute musculoskeletal ankle trauma, Med Decis Making (1988)
X-rays taken for ankle trauma contribute significantly to the cost of health care in this...
The effect of age on the care of women with breast cancer in community hospitals (with Joe Chu), J Gerontol (1987)
We studied the process of care received by 1,680 female breast cancer patients treated in...
Factors explaining the use of health care services by the elderly (with Connie Evashwick), Health Serv Res (1984)
The Anderson model of health services utilization, which relates use of service to predisposing, enabling,...
Prediction of pneumonia in outpatients with acute cough - a statistical approach, J Chron Dis (1984)
Cough is the fifth most common reason for physician visits, but data on acute cough...
Use of ambulatory care services in three provider plans: interactions between patient characteristics and plans, Am J Public Health (1984)
A previous study of low-income enrollees in a closed-panel health maintenance organization (HMO) and a...
Regression analysis in health services research: the use of dummy variables (with Lincoln Nayak Polissar), Med Care (1982)
Dummy variables frequently are used in regression analysis but often in an incorrect fashion. A...
Cluster analysis to determine headache types, J Chronic Dis (1982)
Cluster analysis was used to separate 726 headache patients into clusters of patients with similar...
On the relationships among headache symptoms, Journal of Chronic Disease (now J Clin Epidem) (1982)
Headache classification has evolved through clinical experience because there are no objective findings which define...
Acute headaches; presenting symptoms and diagnostic rules to identify patients with tension and migraine headache , J Chron Dis (1981)
Headache is the ninth most common cause of physician visits, but data on acute headaches...
Increased access to medical care: the impact on health, Med Care (1979)
Many federally financed programs have been launched to improve the access of the poor to...