The Johns Hopkins ACG® System Bibliography provides links to more than 900 papers and reports from across the globe detailing various studies utilizing the ACG System in a variety of locations, populations, and innovative applications.

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Association of Care Management Intensity With Healthcare Utilization in an All-Condition Care Management Program

ABSTRACT Objectives: To identify care needs among Medicaid and Medicare patients in an all-condition care management program involving case managers (CMs) and community health workers (CHWs), […]

One-Year Mortality After Emergency Department Visit for Nonfatal Opioid Poisoning: A Population-Based Analysis

Abstract Study objective We aim to characterize the incidence and risk factors for opioid-related and all-cause mortality in the year after an emergency department (ED) […]

Economic Analysis of Adjuvant Chemoradiotherapy Compared with Chemotherapy in Resected Pancreas Cancer

Abstract Background Population-based survival and costs of pancreas adenocarcinoma patients receiving adjuvant chemoradiation and chemotherapy following pancreaticoduodenectomy are poorly understood. Methods This retrospective cohort study used […]

Production of physician services under fee‐for‐service and blended fee‐for‐service: Evidence from Ontario, Canada

Abstract We examine family physicians’ responses to financial incentives for medical services in Ontario, Canada. We use administrative data covering 2003–2008, a period during which […]

Impact of care provider network characteristics on patient outcomes: Usage of social network analysis and a multi-scale community detection

Abstract Objective We assess healthcare provider collaboration and the impact on patient outcomes using social network analysis, a multi-scale community detection algorithm, and generalized estimating […]

Determinants of vaccination uptake, and influenza vaccine effectiveness in preventing deaths and hospital admissions in the elderly population; Treviso, Italy, 2014/2015-2016/2017 seasons

ABSTRACT Seasonal influenza is an important cause of morbidity and mortality, particularly among the elderly population. Determinants of vaccination uptake and its impact on health […]

Cardiovascular Consequences of Obstructive Sleep Apnea in Women: A Historical Cohort Study

Abstract Objective Background: Evidence on sex differences in the association between obstructive sleep apnea (OSA) and cardiovascular outcomes is limited and controversial. We conducted a […]

Days spent at home in the last 6 months of life: a quality indicator of end of life care in patients with hematologic malignancies

Abstract Despite advances in the management of hematologic malignancies, a significant proportion of patients die of their disease. We used administrative databases in Ontario, Canada […]

Understanding those overdue for cancer screening by five years or more: A retrospective cohort study in Ontario, Canada

Abstract Populations that are more than just slightly overdue for breast, cervical and colorectal screening should likely be targeted for policy and practice interventions. We […]

Health of Spanish centenarians: a cross-sectional study based on electronic health records

Abstract Background With the number of centenarians increasing exponentially in Spain, a deeper knowledge of their socio-demographic, clinical, and healthcare use characteristics is important to […]

Prediction of 30-day pediatric unplanned hospitalizations using the Johns Hopkins Adjusted Clinical Groups risk adjustment system

Abstract Background The Johns Hopkins ACG System is widely used to predict patient healthcare service use and costs. Most applications have focused on adult populations. […]

Population segmentation based on healthcare needs: a systematic review

Abstract Background Healthcare needs-based population segmentation is a promising approach for enabling the development and evaluation of integrated healthcare service models that meet healthcare needs. […]

Prediction Accuracy With Electronic Medical Records Versus Administrative Claims

Abstract Objective:  The objective of this study was to evaluate the incremental predictive power of electronic medical record (EMR) data, relative to the information available […]

Predicting Short-Term Outcomes After Radical Cystectomy Based on Frailty

Abstract Objective To evaluate the impact of frailty on adverse perioperative outcomes in patients treated with radical cystectomy for bladder cancer. Material and Methods We […]

Effectiveness and Safety of Inhaled Corticosteroids in Older Individuals with Chronic Obstructive Pulmonary Disease and/or Asthma. A Population Study

Abstract Rationale Inhaled corticosteroids (ICS) are established medications for the management of both asthma and chronic obstructive pulmonary disease (COPD), two common chronic airway diseases. […]

Symptom trajectories and predictors of severe symptoms in pancreatic adenocarcinoma at the end-of-life: a population based analysis of 2,538 patients

Abstract Background We evaluated symptom trajectories and predictors of reporting severe symptoms in the last 6 months of life among non-resected pancreatic adenocarcinoma (PAC) decedents. […]

Patient-Reported Symptoms Improve Performance of Risk Prediction Models for Emergency Department Visits Among Patients With Cancer: A Population-Wide Study in Ontario Using Administrative Data

Abstract Context Prior work shows measurements of symptom severity using the Edmonton Symptom Assessment System (ESAS) which are associated with emergency department (ED) visits in […]

Frailty, Implantable Cardioverter Defibrillators, and Mortality: a Systematic Review

Abstract   Background Evidence for the benefit of implantable cardioverter defibrillators (ICD) in preventing sudden cardiac death (SCD) in older adults is mixed; age alone […]

Prediction Accuracy With Electronic Medical Records Versus Administrative Claims

Abstract OBJECTIVE: The objective of this study was to evaluate the incremental predictive power of electronic medical record (EMR) data, relative to the information available […]

Impact of Predialysis Psychosocial Conditions on Kidney Transplant Recipient Survival: Evidence Using Propensity Score Matching

Abstract Background: An increased number of end-stage renal disease patients suffer psychosocial conditions and may experience delayed access to transplantation due to listing restrictions. However, […]

A comparison of population segmentation methods

Abstract This paper presents the first comparison of descriptive segmentation methods for population health management. The aim of descriptive segmentation is to identify heterogeneous segments […]

Interaction between neighborhood walkability and traffic-related air pollution on hypertension and diabetes: The CANHEART cohort

Abstract Background Living in unwalkable neighborhoods has been associated with heightened risk for diabetes and hypertension. However, highly walkable environments may have higher concentrations of […]

When the Doctor-Patient Divide Is a Chasm

Abstract For an important group of patients, the divide between themselves and their healthcare team is a chasm. These patients are variously identified in different […]

Prevalence of intellectual and developmental disabilities among first generation adult newcomers, and the health and health service use of this group: A retrospective cohort study

Abstract Background Attention to research and planning are increasingly being devoted to newcomer health, but the needs of newcomers with disabilities remain largely unknown. This […]

Is Post-discharge Rehabilitation Timing Associated with 90-Day Readmission in Primary Total Joint Arthroplasty?

Abstract Background Physical therapy (PT) is an accepted standard of care after total joint arthroplasty (TJA) and essential to maximizing joint functionality and minimizing complications […]

Understanding the impact of a multispecialty electronic consultation service on family physician referral rates to specialists: a randomized controlled trial using health administrative data

Abstract Background Electronic consultation (eConsult) services are secure online applications facilitating provider-to-provider communication. They have been found to improve access to specialist care. However, little […]

A Multi-sourced Data Analytics Approach to Measuring and Assessing Biopsychosocial Complexity: The Vancouver Community Analytics Tool Complexity Module (VCAT-CM)

Abstract Operationalization of the fundamental building blocks of primary care (i.e. empanelment, team-based care and population management) within the context of Community Health Centers requires […]

Profiling hospital performance on the basis of readmission after transcatheter aortic valve replacement in Ontario, Canada

Abstract Background Readmission rates are a widely accepted quality indicator. Our objective was to develop models for calculating case‐mixed adjusted readmission rates after transcatheter aortic […]

Comparing Survey-Based Frailty Assessment to Medicare Claims in Predicting Health Outcomes and Utilization in Medicare Beneficiaries

Abstract   Objectives To assess two models for the prediction of health utilization and functions using standardized in-person assessments of frailty and administrative claims-based geriatric […]

The Incremental Health Care Costs of Frailty Among Home Care Recipients With and Without Dementia in Ontario, Canada: A Cohort Study

Abstract Objective In this study, we investigated the incremental 1-year direct costs of health care associated with frailty among home care recipients in Ontario with and without […]

The Lifestyle Medicine Physician’s Case to Self-Insured Employers: A Business Model for Physicians, a Bargain for Companies

Abstract   A majority of Americans have health care insurance through their employers, the cost for which is rising at an alarming rate. Unfortunately, higher […]

Physician procedure volume and related adverse events after surgically induced abortion: a population-based cohort study

Abstract   BACKGROUND Induced abortion is a common procedure performed by physicians with varying degrees of clinical experience. We aimed to determine whether a physician’s […]

Home care nursing after elective vascular surgery: an opportunity to reduce emergency department visits and hospital readmission

Abstract Background Events occurring outside the hospital setting are underevaluated in surgical quality improvement initiatives and research. Objective To quantify regional variation in home care […]

Nonsteroidal anti-inflammatory drug use and risk of acute kidney injury and hyperkalemia in older adults: a population-based study

Abstract   Background Clinical guidelines caution against nonsteroidal anti-inflammatory drug (NSAID) use in older adults. The study objective was to quantify the 30-day risk of […]

Impactibility Model for Population Health Management in High-Cost Elderly Heart Failure Patients: A Capture Method Using the ACG System

Abstract The aim of the present study is to use the ACG (Adjusted Clinical Groups) System to create an impactibility model by identifying homogeneous clinical […]

Community palliative care initiatives to reduce end-of-life hospital utilization and in-hospital deaths: A population-based observational study evaluating two home care interventions

Abstract Context The end-of-life period is characterized by increased hospital utilization despite patients’ preferences to receive care and die at home. Objectives To evaluate the […]

Do Incentive Payments Reward The Wrong Providers? A Study Of Primary Care Reform In Ontario, Canada

ABSTRACT Primary care payment reform in the US and elsewhere usually involves capitation, often combined with bonuses and incentives. In capitation systems, providing care within […]

Using EMRALD to assess baseline body mass index among children living within and outside communities participating in the Ontario, Canada Healthy Kids Community Challenge

Abstract   Objectives The Healthy Kids Community Challenge is a large-scale, centrally-coordinated, community-based intervention in Ontario, Canada that promotes healthy behaviours towards improving healthy weights […]

Development of Alzheimer disease in old major depressive patients based upon their health status: A retrospective study in Taiwan

Abstract   This study is conducted to investigate the association between major depressive disorder and the subsequent development of Alzheimer disease (AD) in elderly patients […]

Trends in Providing Out-of-Office, Urgent After-Hours, and On-Call Care in British Columbia

Abstract   PURPOSE Providing care in alternative (non-office) locations and outside office hours are important elements of access and comprehensiveness of primary care. We examined […]

Association between allopurinol and cardiovascular outcomes and all‐cause mortality in diabetes: A retrospective, population‐based cohort study

Abstract Aim To assess the association between allopurinol and mortality and cardiovascular outcomes in an allopurinol‐treated diabetes cohort. Materials and Methods We conducted a population‐based […]

An instrumental variable approach quantifies and confirms the duration of pre-transplant dialysis has negative impact on kidney transplant recipient survival

Abstract Dialysis prior to kidney transplantation may have a detrimental effect on post-transplant Outcomes. However, prior studies have not fully characterized the nature of this […]

Patient-reported symptoms following mastectomy alone or lumpectomy plus radiation for early stage breast cancer: a cohort study

Abstract Purpose Studies examining symptom differences between surgeries for breast cancer patients rarely incorporate the effects of adjuvant treatment choice. We sought to understand differences […]

Integrating Social and Behavioral Determinants of Health into Population Health Analytics: A Conceptual Framework and Suggested Road Map

Abstract There is growing recognition that social and behavioral risk factors impact population health outcomes. Interventions that target these risk factors can improve health outcomes. […]

Correlation between Potentially Inappropriate Medication and Alzheimer’s Disease among the Elderly

Abstract   Purpose This study is conducted to explore the association between potentially inappropriate medication (PIM) and Alzheimer’s disease (AD) among the elderly. Methods We […]

Vulnerable And Less Vulnerable Women In High-Deductible Health Plans Experienced Delayed Breast Cancer Care

ABSTRACT The effects of high-deductible health plans (HDHPs) on breast cancer diagnosis and treatment among vulnerable populations are unknown. We examined time to first breast […]

Days at Home in the Last 6 Months of Life: A Patient-Determined Quality Indicator for Cancer Care

ABSTRACT   PURPOSE: Quality end-of-life care (EoLC) is a key aspect of oncology. Days at home in the last 6 months of life represents a […]

Exploring the use of machine learning for risk adjustment: A comparison of standard and penalized linear regression models in predicting health care costs in older adults

Abstract   Background Payers and providers still primarily use ordinary least squares (OLS) to estimate expected economic and clinical outcomes for risk adjustment purposes. Penalized […]

Parenchymal hyperdensity on C-arm CT images after endovascular therapy for acute ischaemic stroke predicts a poor prognosis

ABSTRACT   AIM To investigate whether hyperdense areas (HDAs) observed after endovascular treatment on multisection computed tomography (CT) are related to outcome. MATERIALS AND METHODS Data on […]

Medicaid trends in prescription opioid and non-opioid use by HIV status

Abstract   Background Pain is more common among people living with HIV (PLWH) than their counterparts; however, it is unclear whether analgesic use differs by […]

Performance on the Operant Test Battery in young children exposed to procedures requiring general anaesthesia: the MASK study

Abstract Background It is not known whether the neurotoxicity produced by anaesthetics administered to young animals can also occur in children. Exposure of infant macaques […]

Population risk and burden of health behavioral–related all-cause, premature, and amenable deaths in Ontario, Canada: Canadian Community Health Survey–linked mortality files

Abstract   Purpose To examine the association of all-cause and premature mortality with four modifiable lifestyle behaviors and quantify the burden of behavioral-related premature death in Ontario, […]

Variation in Revascularization Practice and Outcomes in Asymptomatic Stable Ischemic Heart Disease

Abstract   Objectives The aims of this study were to assess variation in revascularization of asymptomatic patients with stable ischemic heart disease, identify the predictors of variation, and […]

Effectiveness of a community care management program for multimorbid elderly patients with heart failure in the Veneto Region

Abstract Background The rapidly growing population of elderly subjects with multimorbidity is at risk of receiving fragmented and uncoordinated care, and have frequent hospitalizations and […]

Attitudes and behaviour towards psychotropic drug prescribing in Swedish primary care: a questionnaire study

Abstract Background The prescribing of psychotropic drugs, i.e. antidepressants, sedatives (anxiolytics, hypnotics), and antipsychotics is considerable and a large proportion is prescribed by general practitioners […]

Association Between Wait Time for Transcatheter Aortic Valve Replacement and Early Postprocedural Outcomes

Abstract Background Rapid growth in transcatheter aortic valve replacement (TAVR) demand has translated to inadequate access, reflected by prolonged wait times. Increasing wait times are […]

Impact of stratification on the effectiveness of a comprehensive patient‐centered strategy for multimorbid patients

Abstract Objective The objective of this work was to assess the effectiveness of a population‐level patient‐centered intervention for multimorbid patients based on risk stratification for […]

Estimates and predictors of health care costs of esophageal adenocarcinoma: a population-based cohort study

Background Esophageal adenocarcinoma (EAC) incidence is increasing rapidly. Esophageal cancer has the second lowest 5-year survival rate of people diagnosed with cancer in Canada. Given […]

Assessing the Impact of Body Mass Index Information on the Performance of Risk Adjustment Models in Predicting Health Care Costs and Utilization

Abstract BACKGROUND: Using electronic health records (EHRs) for population risk stratification has gained attention in recent years. Compared with insurance claims, EHRs offer novel data […]

The Association Between Continuity of Primary Care and Preventive Cancer Screening in Women With Intellectual Disability

Abstract Women with intellectual disability have low screening rates for breast and cervical cancer. This population-based cohort study examined the association between the level of […]

Primary care utilization in people who experience imprisonment in Ontario, Canada: a retrospective cohort study

Abstract Background Access to primary care is an important determinant of health, and data are sparse on primary care utilization for people who experience imprisonment. […]

Impact of timing of methadone initiation on perinatal outcomes following delivery among pregnant women on methadone maintenance therapy in Ontario

Abstract BACKGROUND AND AIMS Methadone maintenance therapy (MMT) is associated with improved outcomes for children exposed to maternal opioid dependence in utero. We examined Ontario’s […]

Association between method of pelvic organ prolapse repair involving the vaginal apex and re-operation: a population-based, retrospective cohort study

Abstract Introduction and hypothesis Vaginal apical suspension is essential for the surgical treatment of pelvic organ prolapse (POP). We aim to evaluate whether the method […]

First Use of a Population Health Management Strategy in Dutch Primary Health Care

Abstract Introduction: Recently, in Dutch health care the focus is shifting from a disease oriented approach to a more population based approach. Since in The […]

Comparing Five Comorbidity Indices to Predict Mortality in Chronic Kidney Disease: A Retrospective Cohort Study

Abstract Background: Several different indices summarize patient comorbidity using health care data. An accurate index can be used to describe the risk profile of patients, […]

Are we making a difference in primary care for adults with intellectual and developmental disabilities?

Abstract Objectives. To examine the impact of the dissemination of guidelines to physicians and of a population-level health communication intervention on the percentage of adults […]

Albuminuria, Reduced Kidney Function, and the Risk of ST‐ and non–ST‐segment–elevation myocardial infarction

Abstract Background Chronic kidney disease is a recognized independent risk factor for cardiovascular disease, but whether the risks of ST‐segment–elevation myocardial infarction (STEMI) and non–ST‐segment–elevation […]

Examination of Health System Resources and Costs Associated With Transitioning Cancer Survivors to Primary Care: A Propensity-Score–Matched Cohort Study

Background: Transitioning low-risk cancer survivors back to their primary care provider (PCP) has been shown to be safe but the effect on health system resources […]

Indianapolis Provider’s Use Of Wraparound Services Associated With Reduced Hospitalizations And Emergency Department Visits

ABSTRACT Recent changes to US reimbursement policies are increasingly holding providers financially accountable for patients’ health. Providing nonmedical services in conjunction with primary care—known as […]

Repeat Emergency Department Visits for Individuals With Intellectual and Developmental Disabilities and Psychiatric Disorders

Abstract Although individuals with intellectual and developmental disabilities (IDD) and psychiatric concerns are more likely than others to visit hospital emergency departments (EDs), the frequency […]

Variation in the health outcomes associated with frailty among home care clients: relevance of caregiver distress and client sex

Abstract Background The identification of contextual factors that modify associations between client frailty and their health and service use outcomes is essential for informed home […]

Respiratory health service utilization of children with neuromuscular disease

Abstract Objectives To quantify health service utilization including assessment, monitoring, and treatment of respiratory complications of children with neuromuscular disease (NMD), identifying practice variation and […]

Rapid repeat pregnancy among women with intellectual and developmental disabilities: a population-based cohort study

Abstract   BACKGROUND Rapid repeat pregnancy within 12 months of a live birth is associated with adverse perinatal outcomes. We evaluated the risk for rapid […]

Assessing Markers From Ambulatory Laboratory Tests for Predicting High-Risk Patients

ABSTRACT Objectives: This exploratory study used outpatient laboratory test results from electronic health records (EHRs) for patient risk assessment and evaluated whether risk markers based on […]

Home Palliative Service Utilization and Care Trajectory Among Ontario Residents Dying on Chronic Dialysis

Background: Many patients who receive chronic hemodialysis have a limited life expectancy comparable to that of patients with metastatic cancer. However, patterns of home palliative […]

Prescription drug claims following a traumatic spinal cord injury for older adults: a retrospective population-based study in Ontario, Canada

Abstract Study design Retrospective cohort study. Objectives The objectives for this study were to examine the prevalence of polypharmacy for people with traumatic spinal cord […]

Population Health Management Exploiting Machine Learning Algorithms to Identify High-Risk Patients

Abstract Population aging and the increase of chronic conditions incidence and prevalence produce a higher risk of hospitalization or death. This is particularly high for […]

Patient-reported symptoms after breast cancer diagnosis and treatment: A retrospective cohort study

Abstract Aim Breast cancer and its treatment are associated with varying symptoms. The province of Ontario (13.6 million) has implemented a provincial programme to screen for symptoms among […]

Neuropsychological and Behavioral Outcomes after Exposure of Young Children to Procedures Requiring General Anesthesia

Abstract   BACKGROUND Few studies of how exposure of children to anesthesia may affect neurodevelopment employ comprehensive neuropsychological assessments. This study tested the hypothesis that […]

The Value of Unstructured Electronic Health Record Data in Geriatric Syndrome Case Identification

Abstract Objectives To examine the value of unstructured electronic health record (EHR) data (free‐text notes) in identifying a set of geriatric syndromes. Design Retrospective analysis […]

Acute vs cumulative benefits of metformin use in patients with type 2 diabetes and heart failure

Abstract   Aims To evaluate the association between metformin use and heart failure (HF) exacerbation in people with type 2 diabetes (T2D) and pre‐existing HF […]

Emergency Department Use: Common Presenting Issues and Continuity of Care for Individuals With and Without Intellectual and Developmental Disabilities

Abstract This population-based cohort study examined the relationship between level of continuity of primary care and subsequent emergency department (ED) visits for adults with (n = 66,484) […]

Supporting general practice to make timely decisions for better health care: a population health approach

Abstract Primary Health Networks (PHNs) are tasked to enhance the efficiency and effectiveness of general practice. Gold Coast Primary Health Network (GCPHN) has been collecting […]

Patient- and hospital-level predictors of vancomycin-resistant Enterococcus (VRE) bacteremia in Ontario, Canada

Abstract   Background Data are limited on risk factors for vancomycin-resistant Enterococcus (VRE) bacteremia. Methods All patients with a confirmed VRE bacteremia in Ontario, Canada, between January […]

Healthcare costs and utilization associated with high-risk prescription opioid use: a retrospective cohort study

Abstract Background Previous studies on high-risk opioid use have only focused on patients diagnosed with an opioid disorder. This study evaluates the impact of various […]

Is case-mix adjustment in primary care at the mercy of coding quality? Yes … and no

BACKGROUND:  Primary care clinicians know that case-mix varies between different physician practices and geographical areas. Leicester City Clinical Commissioning Group (CCG) is now able to quantify […]

Apples and Oranges: Four Definitions of Multiple Chronic Conditions and their Relationship to 30-Day Hospital Readmission

Health Innovation Program, the University of Wisconsin School of Medicine and Public Health from The Wisconsin Partnership Program, and the Community–Academic Partnerships core of the […]

A case-mix classification system for explaining healthcare costs using administrative data in Italy

Abstract Background The Italian National Health Service (NHS) provides universal coverage to all citizens, granting primary and hospital care with a copayment system for outpatient […]

A Canadian Population-Based Cohort to the Study Cost and Burden of Surgically Resected Hidradenitis Suppurativa

Abstract Background: Hidradenitis suppurativa (HS) is a chronic debilitating disease with long-lasting comorbidities that impose direct and indirect costs on the health care system. However, […]

Defining and Assessing Geriatric Risk Factors and Associated Health Care Utilization Among Older Adults Using Claims and Electronic Health Records

Abstract Background: Using electronic health records (EHRs), in addition to claims, to systematically identify patients with factors associated with adverse outcomes (geriatric risk) among older […]

Risk of rhabdomyolysis from 5‐α reductase inhibitors

Abstract Purpose: A recent regulatory warning and case reports have described the development of muscle complications with the use of 5‐α reductase inhibitors (5ARIs). We […]

Evaluating the Impact of Prescription Fill Rates on Risk Stratification Model Performance

Risk adjustment models are traditionally derived from administrative claims. Prescription fill rates—extracted by comparing electronic health record prescriptions and pharmacy claims fills —represent a novel […]

Variation in Access to Kidney Transplantation across Renal Programs in Ontario, Canada

In the United States kidney transplant rates vary significantly across end-stage renal disease (ESRD) networks. We conducted a population-based cohort study to determine whether there […]

Comparing Population-based Risk-stratification Model Performance Using Demographic, Diagnosis and Medication Data Extracted From Outpatient Electronic Health Records Versus Administrative Claims.

Department of Health Policy and Management, Johns Hopkins School of Public Health, Center for Population Health Information Technology, Baltimore, MD HealthPartners, Health Informatics Division, Bloomington, […]

Evidence on multimorbidity from definition to intervention: An overview of systematic reviews

Abstract The increasing challenge of multiple chronic diseases (multimorbidity) requires more evidence-based knowledge and effective practice. In order to better understand the existing evidence on […]

The Association of Frailty With Outcomes and Resource Use After Emergency General Surgery: A Population-Based Cohort Study

BACKGROUND: Older patients undergoing emergency general surgery (EGS) experience high rates of postoperative morbidity and mortality. Studies focused primarily on elective surgery indicate that frailty […]

Apples and Oranges: Four Definitions of Multiple Chronic Conditions and their Relationship to 30-Day Hospital Readmission

OBJECTIVES: To determine the extent of agreement between four commonly used definitions of multiple chronic conditions (MCCs) and compare each definition’s ability to predict 30-day […]

Association of the Hospital Volume of Frail Surgical Patients Cared for with Outcomes after Elective, Major Noncardiac Surgery

Background: Frailty is a risk factor for adverse postoperative outcomes. Hospitals that perform higher volumes of surgery have better outcomes than low-volume providers. We hypothesized […]

Association of Suicidality and Depression With 5α-Reductase Inhibitors

IMPORTANCE There have been concerns raised by patients and regulatory agencies regarding serious psychiatric adverse effects associated with 5α-reductase inhibitors. OBJECTIVE To determine if there […]

Exploring the Johns Hopkins Aggregated Diagnosis Groups in administrative data as a measure of child health

This study explored the utility of the Johns Hopkins Aggregated Diagnostic Groups (ADGs) as a noncategorical measure of child health in administrative health data. Canadian […]

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