Constantine Gatsonis
Biographic Data
| ID | 1662671 |
|---|---|
| NAME | Constantine Gatsonis |
| GIVEN NAMES | Constantine |
| FAMILY NAME | Gatsonis |
| SIGNATURE | GATSONIS C |
| AFFILIATIONS | Harvard University |
| ORCID | 0000-0001-6846-4520 |
| VERIFIED | No |
| TOTAL WORKS | 12 |
| TOTAL CITATIONS | 14 |
| AUTHOR COUNT | 12 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1989 |
| LATEST PUBLICATION YEAR | 2008 |
| H-INDEX | 2 |
Is the Type of Medicare Insurance Associated With Colorectal Cancer Screening Prevalence and Selection of Screening Strategy
BACKGROUND: Medicare managed care (MMC) plans may be better positioned to deliver preventive services than fee-for-service (FFS) insurers. We assessed whether beneficiaries in MMC plans were more likely than those in traditional FFS insurance to receive colorectal cancer (CRC) screening and whether type of insurance was associated with use of specific screening strategies. METHODS: We studied 10,173 respondents to the 2000 Medicare Current Benefi…
Race and Gender Disparities in Rates of Cardiac Revascularization
BACKGROUND: Numerous studies have documented substantial differences by race and gender in the use of coronary artery bypass graft surgery and percutaneous coronary angioplasty. However, few studies have examined whether these differences reflect problems in quality of care. METHOD: We selected a random sample stratified by gender, race, and income of 5026 Medicare beneficiaries aged 65 to 75 who underwent inpatient coronary angiography during 19…
Ambulatory Blood Pressure Responses and the Circumplex Model of Mood
BACKGROUND: The relation between mood or emotions and concurrent ambulatory blood pressure responses holds both fundamental and clinical interest. METHODS: The primary sample consisted of 69 normotensive or borderline hypertensive but otherwise healthy adult males. The validation sample consisted of 85 healthy male undergraduate college students. Both samples underwent half-hourly 24-hour ambulatory blood pressure measurements on four separate wo…
The Boston Aids Survival Score (Bass)
OBJECTIVES: This study developed a new acquired immunodeficiency syndrome (AIDS) severity system by including diagnostic, physiological, functional, and sociodemographic factors predictive of survival. METHODS: Three-hundred five persons with AIDS in Boston were interviewed; their medical records were reviewed and vital status ascertained. RESULTS: Overall median (+/- SD) survival for the cohort from the first interview until death was 560 +/- 14…
The Influence of Health-Related Quality of Life and Social Characteristics on Hospital Use by Patients with Aids in the Boston Health Study
OBJECTIVES: The authors examine whether health-related quality of life (HRQL) and social factors were independent predictors of future hospital use for persons with acquired immunodeficiency syndrome (AIDS). METHODS: A panel of 305 patients with AIDS treated at three provider settings in the Boston, Massachusetts area were enrolled during 1990 and 1991. Data were collected at baseline study enrollment and again 4 months later. Patient interviews,…
Variations in the Utilization of Coronary Angiography for Elderly Patients with an Acute Myocardial Infarction
This article reports a study of variations in the utilization of angiography for Medicare recipients who had an acute myocardial infarction. The study cohort consisted of 1987 Medicare beneficiaries who had a recent acute myocardial infarction. Variations were examined from three perspectives: patient characteristics, regional practice patterns, and on-site availability of the procedure. Factors associated with variation within and among states w…
Changes in insurance status and access to care for persons with Aids in the Boston Health Study
The purpose of this study was to measure unmet needs and changes in insurance status for persons with acquired immunodeficiency syndrome (AIDS). Thirty-six percent of the study's Boston-area respondents (n = 305) had a change in insurance coverage between AIDS diagnosis and interview. Medicaid coverage increased from 14% to 41%. Pneumocystis carinii pneumonia prophylaxis was nearly universal. Only 5% did not receive zidovudine, and intravenous dr…
Geographic Variation of Procedure Utilization
In this study, an abbreviated introduction to hierarchical statistical models for quantifying and explaining variations in the utilization of medical care is presented. The illustrative example was derived from an analysis of interstate variation in coronary angiography utilization for Medicare patients with a recent acute myocardial infarction. The hierarchical model distinguished within-from between-states variation: the former was modeled via …
Relaxation therapy for hypertension
We determined the effect of relaxation therapy for hypertension in patients whose blood pressure remained elevated despite the use of antihypertensive medication. The effect was assessed in multiple settings, including the relaxation therapist's office, the Hypertension Clinic, and the patient's natural environment, the latter using 24-hour automated ambulatory blood pressure measures. Nineteen patients were randomized either to temperature biofe…
Forthcoming in American Journal of Primatology
Heart rate and social status among male cynomolgus monkeys ( Macaca fascicularis ) housed in disrupted social groupings
The relationship between social status and telemetrically recorded heart rate (HR) was studied among 29 adult male cynomolgus monkeys (Macaca fascicularis) which had been maintained in six social groups (n = four or five) for 26 months. The membership of each group was reorganized periodically (20 times in 26 months) by shifting monkeys from group to group in a way that maximized each animal's exposure to social strangers. The social behavior of …
Multiple correlation
This article discusses power and sample size calculations for observational studies in which the values of the independent variables cannot be fixed in advance but are themselves outcomes of the study. It reviews the mathematical framework applicable when a multivariate normal distribution can be assumed and describes a method for calculating exact power and sample sizes using a series expansion for the distribution of the multiple correlation co…
Changes in insurance status and access to care for persons with Aids in the Boston Health Study
The purpose of this study was to measure unmet needs and changes in insurance status for persons with acquired immunodeficiency syndrome (AIDS). Thirty-six percent of the study's Boston-area respondents (n = 305) had a change in insurance coverage between AIDS diagnosis and interview. Medicaid coverage increased from 14% to 41%. Pneumocystis carinii pneumonia prophylaxis was nearly universal. Only 5% did not receive zidovudine, and intravenous dr…
Multiple correlation
This article discusses power and sample size calculations for observational studies in which the values of the independent variables cannot be fixed in advance but are themselves outcomes of the study. It reviews the mathematical framework applicable when a multivariate normal distribution can be assumed and describes a method for calculating exact power and sample sizes using a series expansion for the distribution of the multiple correlation co…
The Boston Aids Survival Score (Bass)
OBJECTIVES: This study developed a new acquired immunodeficiency syndrome (AIDS) severity system by including diagnostic, physiological, functional, and sociodemographic factors predictive of survival. METHODS: Three-hundred five persons with AIDS in Boston were interviewed; their medical records were reviewed and vital status ascertained. RESULTS: Overall median (+/- SD) survival for the cohort from the first interview until death was 560 +/- 14…
Multiple correlation
This article discusses power and sample size calculations for observational studies in which the values of the independent variables cannot be fixed in advance but are themselves outcomes of the study. It reviews the mathematical framework applicable when a multivariate normal distribution can be assumed and describes a method for calculating exact power and sample sizes using a series expansion for the distribution of the multiple correlation co…
Forthcoming in American Journal of Primatology
Heart rate and social status among male cynomolgus monkeys ( Macaca fascicularis ) housed in disrupted social groupings
The relationship between social status and telemetrically recorded heart rate (HR) was studied among 29 adult male cynomolgus monkeys (Macaca fascicularis) which had been maintained in six social groups (n = four or five) for 26 months. The membership of each group was reorganized periodically (20 times in 26 months) by shifting monkeys from group to group in a way that maximized each animal's exposure to social strangers. The social behavior of …
Relaxation therapy for hypertension
We determined the effect of relaxation therapy for hypertension in patients whose blood pressure remained elevated despite the use of antihypertensive medication. The effect was assessed in multiple settings, including the relaxation therapist's office, the Hypertension Clinic, and the patient's natural environment, the latter using 24-hour automated ambulatory blood pressure measures. Nineteen patients were randomized either to temperature biofe…
Geographic Variation of Procedure Utilization
In this study, an abbreviated introduction to hierarchical statistical models for quantifying and explaining variations in the utilization of medical care is presented. The illustrative example was derived from an analysis of interstate variation in coronary angiography utilization for Medicare patients with a recent acute myocardial infarction. The hierarchical model distinguished within-from between-states variation: the former was modeled via …
Changes in insurance status and access to care for persons with Aids in the Boston Health Study
The purpose of this study was to measure unmet needs and changes in insurance status for persons with acquired immunodeficiency syndrome (AIDS). Thirty-six percent of the study's Boston-area respondents (n = 305) had a change in insurance coverage between AIDS diagnosis and interview. Medicaid coverage increased from 14% to 41%. Pneumocystis carinii pneumonia prophylaxis was nearly universal. Only 5% did not receive zidovudine, and intravenous dr…
Variations in the Utilization of Coronary Angiography for Elderly Patients with an Acute Myocardial Infarction
This article reports a study of variations in the utilization of angiography for Medicare recipients who had an acute myocardial infarction. The study cohort consisted of 1987 Medicare beneficiaries who had a recent acute myocardial infarction. Variations were examined from three perspectives: patient characteristics, regional practice patterns, and on-site availability of the procedure. Factors associated with variation within and among states w…
The Influence of Health-Related Quality of Life and Social Characteristics on Hospital Use by Patients with Aids in the Boston Health Study
OBJECTIVES: The authors examine whether health-related quality of life (HRQL) and social factors were independent predictors of future hospital use for persons with acquired immunodeficiency syndrome (AIDS). METHODS: A panel of 305 patients with AIDS treated at three provider settings in the Boston, Massachusetts area were enrolled during 1990 and 1991. Data were collected at baseline study enrollment and again 4 months later. Patient interviews,…
The Boston Aids Survival Score (Bass)
OBJECTIVES: This study developed a new acquired immunodeficiency syndrome (AIDS) severity system by including diagnostic, physiological, functional, and sociodemographic factors predictive of survival. METHODS: Three-hundred five persons with AIDS in Boston were interviewed; their medical records were reviewed and vital status ascertained. RESULTS: Overall median (+/- SD) survival for the cohort from the first interview until death was 560 +/- 14…
Ambulatory Blood Pressure Responses and the Circumplex Model of Mood
BACKGROUND: The relation between mood or emotions and concurrent ambulatory blood pressure responses holds both fundamental and clinical interest. METHODS: The primary sample consisted of 69 normotensive or borderline hypertensive but otherwise healthy adult males. The validation sample consisted of 85 healthy male undergraduate college students. Both samples underwent half-hourly 24-hour ambulatory blood pressure measurements on four separate wo…
Race and Gender Disparities in Rates of Cardiac Revascularization
BACKGROUND: Numerous studies have documented substantial differences by race and gender in the use of coronary artery bypass graft surgery and percutaneous coronary angioplasty. However, few studies have examined whether these differences reflect problems in quality of care. METHOD: We selected a random sample stratified by gender, race, and income of 5026 Medicare beneficiaries aged 65 to 75 who underwent inpatient coronary angiography during 19…
Is the Type of Medicare Insurance Associated With Colorectal Cancer Screening Prevalence and Selection of Screening Strategy
BACKGROUND: Medicare managed care (MMC) plans may be better positioned to deliver preventive services than fee-for-service (FFS) insurers. We assessed whether beneficiaries in MMC plans were more likely than those in traditional FFS insurance to receive colorectal cancer (CRC) screening and whether type of insurance was associated with use of specific screening strategies. METHODS: We studied 10,173 respondents to the 2000 Medicare Current Benefi…
Medicine (11 works) · Internal Medicine (8 works) · Internal Medicine (7 works) · Demography (4 works) · Psychology (4 works) · Cardiology (3 works) · Cohort (3 works) · Environmental health (3 works) · Gerontology (3 works) · Gerontology (3 works)