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Jun Ma
Journal Articles

Bar Charts Enhance Bland-Altman Plots when Value Ranges are Limited.

Mark Smith, Jun Ma, Randall Stafford
Journal of Clinical Epidemiology , 2009

Objective

A common form of validation study compares alternative methods for collecting data. The Bland-Altman plot pairs observations across methods and plots their mean values vs. their difference. This method provides only limited information, however, when the range of observed values is small relative to the number of observations. This brief report shows how adding a simple bar chart to a Bland-Altman plot adds essential additional information.

Study Design and Setting

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Journal Articles

Adult Obesity and Office-based Quality of Care in the United States

Jun Ma, Lan Xiao, Randall Stafford
Obesity , 2009

Nationally representative data on the quality of care for obese patients in US-ambulatory care settings are limited. We conducted a cross-sectional analysis of the 2005 and 2006 National Ambulatory Medical Care Survey (NAMCS). We examined obesity screening, diagnosis, and counseling during adult visits and associations with patient and provider characteristics. We also assessed performance on 15 previously published ambulatory quality indicators for obese vs. normal/overweight patients. Nearly 50% (95% confidence interval (CI): 46–54%) of visits

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Journal Articles

Women's Awareness and Knowledge of Hormone Therapy Post-Women's Health Initiative

AJ Rigby, Jun Ma, Randall S. Stafford
Menopause , 2007

Objective: Findings from the Women's Health Initiative (WHI) failed to confirm previous expectations about the net benefits of menopausal hormone therapy and have resulted in reduced use of these medications. The aim of this study was to evaluate women's awareness and knowledge concerning the risks and benefits of hormone therapy.

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Journal Articles

Electronic Health Record Use and the Auality of Ambulatory Care in the United States

JA Linder, Jun Ma, DW Bates, B Middleton, Randall S. Stafford
Archives of Internal Medicine , 2007

Background: Electronic health records (EHRs) have been proposed as a sustainable solution for improving the quality of medical care. We assessed the association between EHR use, as implemented, and the quality of ambulatory care in a nationally representative survey.

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Journal Articles

Changes in Antihypertensive Prescribing During US Outpatient Visits for Uncomplicated Hypertension Between 1993 and 2004

Jun Ma, KV Lee, Randall S. Stafford
Hypertension , 2006

Monitoring national patterns of antihypertensive drug therapy is essential to assessing adherence to treatment guidelines and the impact of major scientific publications on physician prescribing. We analyzed data from 2 US National Ambulatory Care Surveys to examine trends between 1993 and 2004 in the prescription of antihypertensive drug classes for uncomplicated hypertension and the association between thiazide and beta-blocker prescribing and physician and patient characteristics.

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Journal Articles

Depression treatment during outpatient visits by U.S. children and adolescents

Jun Ma, KV Lee, Randall Stafford
Journal of Adolescent Health , 2005

Purpose:

Depression affects approximately 2-8% of all children and adolescents, and treatment of depression in children and adolescents has been the center of recent serious debates. We examined national trends in depression visits and treatment among outpatients aged 7 to 17 years.

Methods:

We analyzed visit-based data between 1995 and 2002 in two national ambulatory care surveys.

Results:

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Journal Articles

Quality of US Outpatient Care: Temporal Changes and Racial/Ethnic Disparities

Jun Ma, Randall Stafford
Archives of Internal Medicine , 2005

Background: The current national measure set for the quality of health care underrepresents the spectrum of outpatient care and makes limited use of readily available national ambulatory care survey data.

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Journal Articles

National trends in statin use by coronary heart disease risk category

Jun Ma, NL Sehgal, JZ Ayanian, Randall Stafford
PLoS Medicine , 2005

BACKGROUND: Only limited research tracks United States trends in the use of statins recorded during outpatient visits, particularly use by patients at moderate to high cardiovascular risk.

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Journal Articles

U.S. adolescents receive suboptimal preventive counseling during ambulatory care

Jun Ma, Yun Wang, Randall S. Stafford, Jun Ma, Yun Wang, Randall S. Stafford
Journal of Adolescent Health , 2005

Purpose:

To examine U.S. adolescents' (age 13-18) utilization of ambulatory care and the likelihood of receiving preventive counseling from 1993 through 2000.

Methods:

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Journal Articles

Diet and Physical Activity Counseling During Ambulatory Care Visits in the United States

Jun Ma, GG Urizar, T Alehegn, Randall Stafford
Preventive Medicine , 2004

BACKGROUND: Research is limited regarding national patterns of behavioral counseling during ambulatory care. We examined time trends and independent correlates of diet and physical activity counseling for American adults with an elevated cardiovascular risk during their outpatient visits.

METHODS: The National Ambulatory Medical Care Survey (NAMCS) and National Hospital Ambulatory Medical Care Survey (NHAMCS) provided 1992-2000 national estimates of counseling practices in private physician offices and hospital outpatient departments.

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Journal Articles

Impact of Clinical Trial Results on National Trends in Alpha-Blocker Prescribing, 1996-2002

Randall S. Stafford, Curt Furberg, Stan Finkelstein, Iain Cockburn, Tseday Alehegn, Jun Ma
Journal of the American Medical Association , 2004
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Journal Articles

Antioxidant intakes and smoking status: data from the continuing survey of food intakes by individuals 1994-1996

Jun Ma, J Hampl, NM Betts
American Journal of Clinical Nutrition , 2000

BACKGROUND: Cigarette smoking is a major risk factor for several chronic oxidative diseases that can be ameliorated by antioxidants.

OBJECTIVES: This study identified the typical dietary intakes and the major food group contributors of the antioxidants beta-carotene, vitamin C, and vitamin E by smoking status.

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