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Coarsened exact matching

Min Su, Zhongliang Zhou, Yafei Si, Xiaolin Wei, Yongjian Xu, Xiaojing Fan, Gang Chen
BACKGROUND: China has three basic health insurance schemes: Urban Employee Basic Medical Insurance (UEBMI), Urban Resident Basic Medical Insurance (URBMI) and New Rural Cooperative Medical Scheme (NRCMS). This study aimed to compare the equity of health-related quality of life (HRQoL) of residents under any two of the schemes. METHODS: Using data from the 5th National Health Services Survey of Shaanxi Province, China, coarsened exact matching method was employed to control confounding factors...
March 7, 2018: Health and Quality of Life Outcomes
Anusha M Vable, Mathew V Kiang, Sanjay Basu, Kara E Rudolph, Ichiro Kawachi, S V Subramanian, M Maria Glymour
Background: Military service is associated with smoking initiation, but U.S. veterans are also eligible for special social, financial, and healthcare benefits, which are associated with smoking cessation. A key public health question is how these offsetting pathways affect health disparities; we assessed the net effects of military service on later life pulmonary function among Korean War era veterans by childhood socio-economic status (cSES). Methods: Data came from U...
March 2, 2018: Military Medicine
J L Arco-Tirado, F Fernández-Martín, A M Ramos-García, L Littvay, J Villoria, J A Naranjo
This observational study intends to estimate the causal effects of an English as a Medium of Instruction (EMI) program (as predictor) on students Grade Point Average (GPA) (as outcome) at a particular University in Spain by using a Counterfactual Impact Evaluation (CIE). The need to address the crucial question of causal inferences in EMI programs to produce credible evidences of successful interventions contrasts, however, with the absence of experimental or quasi-experimental research and evaluation designs in the field...
February 21, 2018: Evaluation and Program Planning
David R Veltre, Paul H Yi, David C Sing, Emily J Curry, Atsushi Endo, Eric L Smith, Xinning Li
Insurance status has been shown to be a predictor of patient morbidity and mortality. The purpose of this study was to evaluate the effect of patient insurance status on the in-hospital complication rates following total knee arthroplasty. Data were obtained from the Nationwide Inpatient Sample (2004 through 2011). Patient demographics and comorbidities were analyzed and stratified by insurance type. Analysis was performed with a matched cohort comparing complication rates between patients with Medicare vs private insurance using the coarsened exact matching algorithm and multivariable logistic regression...
March 1, 2018: Orthopedics
Caitlin W Hicks, Besma Nejim, Satinderjit Locham, Hanaa D Aridi, Marc L Schermerhorn, Mahmoud B Malas
BACKGROUND: The U.S. Centers for Medicare and Medicaid Services (CMS) has defined a set of high-risk criteria to help define patients who are appropriate for carotid artery stenting (CAS), but these criteria have never been validated. We aimed to validate the CMS high-risk criteria in a nationally representative cohort of patients undergoing CAS and carotid endarterectomy (CEA). METHODS: All patients undergoing CAS (with embolic protection) or CEA in the Vascular Quality Initiative (VQI) database (2013-2016) were included...
January 17, 2018: Journal of Vascular Surgery
Rebecca Craig-Schapiro, Besma Nejim, Isibor Arhuidese, Mahmoud B Malas
While studies demonstrate poor outcomes of lower extremity revascularization in end-stage renal disease patients, little is known about results in renal transplant patients. We analyzed 2-year primary patency and limb salvage outcomes and associated risk factors of transplant (N=202) and non-transplant patients (N=25,274) in the Vascular Quality Initiative database undergoing infrainguinal bypass from 2003-2016. Multivariable Cox regression analysis and coarsened exact matching with many-to-one were employed...
December 29, 2017: American Journal of Transplantation
Hanaa Dakour Aridi, Nawar Paracha, Besma Nejim, Satinderjit Locham, Mahmoud B Malas
OBJECTIVE: Studies on the safety of carotid endarterectomy (CEA) under different anesthetic techniques are sometimes contradictory. The aim of this study was to compare real-world outcomes of CEA under general anesthesia (GA) vs regional or local anesthesia (RA/LA). METHODS: A retrospective analysis of the Vascular Quality Initiative database (2003-2017) was performed. Primary outcomes included perioperative stroke, death, and myocardial infarction (MI) occurring during the hospital stay...
December 11, 2017: Journal of Vascular Surgery
Mohini Dasari, Siddarth D David, Elizabeth Miller, Juan Carlos Puyana, Nobhojit Roy
Introduction: While females generally have better outcomes than males after traumatic injury, higher mortality has been shown to occur in females after intentional trauma in lower-income countries. However, gender differences in trauma outcomes in different countries have not been previously compared. We conducted a two-country comparative analysis to characterise gender differences in mortality for different mechanisms of injury. Methods: Two urban trauma databases were analysed from India and the USA for fall, motor vehicle collision (MVC) and assault patients between 2013 and 2015...
2017: BMJ Global Health
Daniel Vail, Tej D Azad, Chloe O'Connell, Summer S Han, Anand Veeravagu, John K Ratliff
STUDY DESIGN: Retrospective analysis on a national longitudinal database (2007-2014). OBJECTIVE: To determine the association between arthrodesis and complication rates, costs, surgical revision, and postoperative opioid prescription. SUMMARY OF BACKGROUND DATA: Arthrodesis in patients receiving laminectomy for lumbar spondylolisthesis remains controversial. However, population-level evidence to support the use of arthrodesis remains limited...
December 5, 2017: Spine
Hannah I Chaudry, Theodore B Curran, Bruce W Andrus, Sheila M Conley, James T DeVries
OBJECTIVE: The choice of antithrombotic agent used during percutaneous coronary intervention (PCI) is controversial. While earlier studies suggested a reduction in bleeding events with bivalirudin, these studies were confounded by the concomitant use of glycoprotein IIbIIIa inhibitors (GPI) in the heparin group. More recent studies have challenged the superiority of bivalirudin, pointing to an increased risk of stent thrombosis. Real-world data remains limited. METHODS: We queried our institutional catheterization laboratory database for all PCI cases performed between January 2003 and December 2012 using only heparin or only bivalirudin (no use of GPI)...
September 10, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
Muhammad Ali Chaudhary, Adil A Shah, Cheryl K Zogg, Navin Changoor, Grace Chao, Stephanie Nitzschke, Joaquim M Havens, Adil H Haider
BACKGROUND: About 19% of the United States population lives in rural areas and is served by only 10% of the physician workforce. If this misdistribution represents a shortage of available surgeons, it is possible that outcomes for rural patients may suffer. The objective of this study was to explore differences in outcomes for emergency general surgery (EGS) conditions between rural and urban hospitals using a nationally representative sample. METHODS: Data from the 2007-2011 National Inpatient Sample were queried for adult patients (≥18 years) with a primary diagnosis consistent with an EGS condition, as defined by the American Association for the Surgery of Trauma...
October 2017: Journal of Surgical Research
Angela Y Chang, Yunfei Li, Osondu Ogbuoji
Background: We revisit the question of the role health insurance coverage played in increasing use of skilled birth attendants (SBA) at delivery in Rwanda. Previous studies have suggested that enrollment in Mutuelles health insurance increased the odds of using an SBA by up to 163%. Methods: We take advantage of latest Rwanda Demographic Health Survey (NISR M, Macro O. Rwanda Demographic and Health Survey 2010. National Institute of Statistics of Rwanda and Ministry of Health, 2012...
September 11, 2017: Journal of Public Health
Réza Behrouz, Jaime Masjuán-Vallejo, Rocío Vera, Joshua Z Willey, Mickael Zedet, Solène Moulin, Charlotte Cordonnier, Catharina J M Klijn, Karin Kanselaar, Maaike Dirks, Brian Silver, Muhib Khan, Mahmoud R Azarpazhooh, Daniel A Godoy, Christine Roffe, Lizz Paley, Benjamin D Bray, Craig J Smith, Mario Di Napoli
BACKGROUND: Nonagenarians are under-represented in thrombolytic trials for acute ischemic stroke (AIS). The effectiveness of intravenous thrombolytics in nonagenarians in terms of safety and outcome is not well established. MATERIALS AND METHODS: We used a multinational registry to identify patients aged 90 years or older with good baseline functional status who presented with AIS. Differences in outcomes-disability level at 90 days, frequency of symptomatic intracerebral hemorrhage (sICH), and mortality-between patients who did and did not receive thrombolytics were assessed using multivariable logistic regression, adjusted for prespecified prognostic factors...
January 2018: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
R Spence, J Scott, A Haider, P Navsaria, A Nicol
BACKGROUND: The unacceptably high rate of death and disability due to injury in sub-Saharan Africa is alarming. The objective of this work is to compare mortality rates between severely injured trauma patients at a high volume trauma centre in South Africa with matched patients in the United States. METHOD: Clinical databases from the Groote Schuur Hospital (GSH) for patients treated in Cape Town, South Africa and the American College of Surgeon's National Trauma Databank (NTDB) for patients treated at large academic trauma centres in the US were used...
September 2017: South African Journal of Surgery. Suid-Afrikaanse Tydskrif Vir Chirurgie
Hanaa Dakour Aridi, Satinderjit Locham, Besma Nejim, Mahmoud B Malas
OBJECTIVE: The aim of this study was to analyze the rates, reasons, and risk factors of 30-day readmission, both planned and unplanned, after carotid revascularization as well as to evaluate major outcomes associated with those readmissions. METHODS: Using the Premier Healthcare database, we retrospectively identified patients undergoing carotid endarterectomy (CEA) and carotid artery stenting (CAS) between 2009 and 2015. The primary outcome was 30-day all-cause readmission...
November 2017: Journal of Vascular Surgery
Lawrence Lee, Kimberly Edwards, Iain A Hunter, John E Hartley, Sam B Atallah, Matthew R Albert, James Hill, John R Monson
BACKGROUND: There are no data comparing the quality of local excision of rectal neoplasms using transanal endoscopic microsurgery and transanal minimally invasive surgery. OBJECTIVE: The purpose of this study was to compare the incidence of tumor fragmentation and positive margins for patients undergoing local excision of benign and malignant rectal neoplasms using transanal endoscopic microsurgery versus transanal minimally invasive surgery. DESIGN: This was a multi-institutional cohort study using coarsened exact matching...
September 2017: Diseases of the Colon and Rectum
Walter Dorigo, Aaron Fargion, Elena Giacomelli, Giulia Bassoli, Raffaele Pulli, Giovanni Pratesi, Gabriele Piffaretti, Carlo Pratesi
OBJECTIVE: The aim of the study was to describe the perioperative and long-term results of carotid endarterectomy (CEA) in patients aged 60 or less and compare them to patients of more advanced age in a retrospective single-centre case-control study. METHODS: From January 1996 to December 2014, 5893 consecutive CEAs were performed in our institution. Data concerning these interventions were prospectively inserted in a dedicated database. A retrospective analysis of that database was performed and 457 interventions performed in patients aged 60 or less were found (group 1)...
July 21, 2017: World Journal of Surgery
Joe Alexander, Roger A Edwards, Alberto Savoldelli, Luigi Manca, Roberto Grugni, Birol Emir, Ed Whalen, Stephen Watt, Marina Brodsky, Bruce Parsons
BACKGROUND: More patient-specific medical care is expected as more is learned about variations in patient responses to medical treatments. Analytical tools enable insights by linking treatment responses from different types of studies, such as randomized controlled trials (RCTs) and observational studies. Given the importance of evidence from both types of studies, our goal was to integrate these types of data into a single predictive platform to help predict response to pregabalin in individual patients with painful diabetic peripheral neuropathy (pDPN)...
July 20, 2017: BMC Medical Research Methodology
Alix S Winter, Robert J Sampson
OBJECTIVES: To assess the relationships between childhood lead exposure and 3 domains of later adolescent health: mental, physical, and behavioral. METHODS: We followed a random sample of birth cohort members from the Project on Human Development in Chicago Neighborhoods, recruited in 1995 to 1997, to age 17 years and matched to childhood blood test results from the Department of Public Health. We used ordinary least squares regression, coarsened exact matching, and instrumental variables to assess the relationship between average blood lead levels in childhood and impulsivity, anxiety or depression, and body mass index in adolescence...
September 2017: American Journal of Public Health
Stéfanie André, Caroline Dewilde, Ruud Luijkx
Integrating housing tenure in Instrumental Motivation Theory predicts a tenure gap in electoral participation, as homeowners would be more motivated to vote compared with tenants. The empirical question is whether this effect is causal or rather due to selection into different housing tenures. This question is tackled using coarsened exact matching (CEM) on data for 19 countries, allowing us to better control for endogeneity. Even then, homeowners are found to vote more often than tenants. This association is stronger in countries characterized by a strong pro-homeownership ideology and/or where the financialization of housing markets turned houses into assets...
June 2017: International Journal of Comparative Sociology
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