Abstract:
BACKGROUND:Case-control studies are a common and efficient means of studying rare diseases or illnesses with long latency periods. Matching of cases and controls is frequently employed to control the effects of known potential confounding variables. The analysis of matched data requires specific statistical methods. METHODS:The objective of this study was to determine the proportion of published, peer-reviewed matched case-control studies that used statistical methods appropriate for matched data. Using a comprehensive set of search criteria we identified 37 matched case-control studies for detailed analysis. RESULTS:Among these 37 articles, only 16 studies were analyzed with proper statistical techniques (43%). Studies that were properly analyzed were more likely to have included case patients with cancer and cardiovascular disease compared to those that did not use proper statistics (10/16 or 63%, versus 5/21 or 24%, P = 0.02). They were also more likely to have matched multiple controls for each case (14/16 or 88%, versus 13/21 or 62%, P = 0.08). In addition, studies with properly analyzed data were more likely to have been published in a journal with an impact factor listed in the top 100 according to the Journal Citation Reports index (12/16 or 69%, versus 1/21 or 5%, P ≤ 0.0001). CONCLUSION:The findings of this study raise concern that the majority of matched case-control studies report results that are derived from improper statistical analyses. This may lead to errors in estimating the relationship between a disease and exposure, as well as the incorrect adaptation of emerging medical literature.
journal_name
Clin Epidemioljournal_title
Clinical epidemiologyauthors
Niven DJ,Berthiaume LR,Fick GH,Laupland KBdoi
10.2147/CLEP.S30816subject
Has Abstractpub_date
2012-01-01 00:00:00pages
99-110issn
1179-1349pii
clep-4-099journal_volume
4pub_type
杂志文章abstract:AIM OF DATABASE:The aim of the Danish Heart Failure Registry (DHFR) is to monitor and improve the care of patients with incident heart failure (HF) in Denmark. STUDY POPULATION:The DHFR includes inpatients and outpatients (≥18 years) with incident HF. Reporting to the DHFR is mandatory for the Danish hospital departme...
journal_title:Clinical epidemiology
pub_type: 杂志文章,评审
doi:10.2147/CLEP.S99504
更新日期:2016-10-25 00:00:00
abstract::Background: The Swedish National Patient Registry (NPR) is a nationwide registry that is used extensively for epidemiological research. Using the NPR, we recently found a recurrent pregnancy loss (RPL) incidence of 650/100,000 (0.65%) pregnant women in Sweden. It is of great importance that the quality of the coding i...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S199206
更新日期:2019-05-08 00:00:00
abstract:PURPOSE:Rotavirus (RV) is a leading cause of severe gastroenteritis (GE) in children across the world. As there is a lack of epidemiological data for RV gastroenteritis (RVGE) in Saudi Arabia, this hospital-based study was designed to estimate the disease burden of RVGE and assess the prevalent RV types in Saudi childr...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S69502
更新日期:2015-02-11 00:00:00
abstract:Aim:To improve consistency between register studies in Sweden and ensure valid comparisons of possible changes in alcohol-related disorders and diseases (ARDDs) over time, we propose a definition of ARDDs. Based on this definition, we examined Sweden's incidence rates of ARDDs from 1970 to 2018 in non-primary healthcar...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S285936
更新日期:2020-12-31 00:00:00
abstract:AIM OF THE DATABASE:The main purpose of the database of the Danish Renal Cancer Group (DaRenCaData) is to improve the quality of renal cancer treatment in Denmark and secondarily to conduct observational research. STUDY POPULATION:DaRenCaData includes all Danish patients with a first-time diagnosis of renal cancer in ...
journal_title:Clinical epidemiology
pub_type: 杂志文章,评审
doi:10.2147/CLEP.S106042
更新日期:2016-10-25 00:00:00
abstract:BACKGROUND:Large-scale clinical registries are increasingly recognized as important resources for quality assurance and research to inform clinical decision-making and health policy. We established a clinical registry (SpineData) in a conservative care setting where more than 10,000 new cases of spinal pain are assesse...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S83830
更新日期:2015-08-13 00:00:00
abstract:Purpose:This paper aims to compare the clinical effectiveness of oral anti-osteoporosis drugs based on the observed risk of fracture while on treatment in primary care actual practice. Materials and methods:We investigated two primary care records databases covering UK National Health Service (Clinical Practice Resear...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S164112
更新日期:2018-10-09 00:00:00
abstract::[This corrects the article DOI: 10.2147/CLEP.S249903.]. ...
journal_title:Clinical epidemiology
pub_type: 杂志文章,已发布勘误
doi:10.2147/CLEP.S259005
更新日期:2020-04-29 00:00:00
abstract:Background:Decision makers in health care increasingly rely on nonrandomized database analyses to assess the effectiveness, safety, and value of medical products. Health care data scientists use data-adaptive approaches that automatically optimize confounding control to study causal treatment effects. This article summ...
journal_title:Clinical epidemiology
pub_type: 杂志文章,评审
doi:10.2147/CLEP.S166545
更新日期:2018-07-06 00:00:00
abstract:BACKGROUND:Assessment of psychosocial functioning in people with schizophrenia is important. The Global Assessment of Functioning (GAF-F) scale represents a widely applied, easy, and quick tool, but its validity and reliability have been debated. The aim was to investigate whether GAF-F scores are associated with other...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S109036
更新日期:2016-09-02 00:00:00
abstract:Purpose:Comorbidity indices are often used to measure comorbidities in register-based research. We aimed to adapt the Charlson comorbidity index (CCI) to a Swedish setting. Methods:Four versions of the CCI were compared and evaluated by disease-specific experts. Results:We created a cohesive coding system for CCI to ...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S282475
更新日期:2021-01-12 00:00:00
abstract:OBJECTIVES:Translational epidemiology studies often use archived tumor specimens to evaluate genetic hypotheses involving cancer outcomes. When the exposure of interest is a germline polymorphism, a key concern is whether the genotype assayed from tumor-derived DNA is representative of the germline. We evaluated the co...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S13811
更新日期:2010-10-22 00:00:00
abstract::The Danish health care system provides partial reimbursement of most prescription medications in Denmark. The dispensation of prescription medications is registered in administrative databases. Each time a prescription is redeemed at a pharmacy, an electronic record is generated with information related to the user, p...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S37587
更新日期:2012-01-01 00:00:00
abstract:BACKGROUND:Primary hyperparathyroidism (pHPT) is associated with an increased risk of developing breast cancer, but little is known about the underlying factors. The aim of this study was to compare women with a history of pHPT and a reference population in terms of standard factors predictive of prognosis and response...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S17298
更新日期:2011-03-25 00:00:00
abstract:BACKGROUND:Physical activity (PA) and its relationship with all-cause mortality suggest a strong and consistent inverse association. This study prospectively investigated the association between PA level and mortality among participants of the Norwegian Women and Cancer (NOWAC) Study. METHODS:A total of 66,136 NOWAC p...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S22681
更新日期:2011-01-01 00:00:00
abstract:PURPOSE:Large-scale observational studies based on existing medical databases may have an important role in studies of long-term effects of different treatments in prostate cancer patients if the coding of the treatment is valid. We therefore estimated the positive predictive value (PPV) and negative predictive value (...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S32313
更新日期:2012-01-01 00:00:00
abstract:AIM:In 2008, the Danish National Chronic Lymphocytic Leukemia Registry was founded within the Danish National Hematology Database. The primary aim of the registry is to assure quality of diagnosis and care of patients with chronic lymphocytic leukemia (CLL) in Denmark. Secondarily, to evaluate adherence to national gui...
journal_title:Clinical epidemiology
pub_type: 杂志文章,评审
doi:10.2147/CLEP.S99486
更新日期:2016-10-25 00:00:00
abstract:Purpose:Apolipoproteins C-I, C-II, C-III and E have been associated with risk of arterial thrombotic diseases. We investigated whether these apolipoproteins have prothrombotic properties and are associated with risk of venous thromboembolism (VTE). Patients and methods:A total of 127 VTE patients and 299 controls were...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S196266
更新日期:2019-07-22 00:00:00
abstract:OBJECTIVE:The Department of Hematology, Zealand University Hospital, Denmark, and the National Institute of Public Health, University of Southern Denmark, created the first nationwide, population-based, and the most comprehensive cross-sectional health-related quality of life (HRQoL) survey of patients with myeloprolif...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S117587
更新日期:2017-03-02 00:00:00
abstract:OBJECTIVE:To validate a clinical database for nonmelanoma skin cancer (NMSC) with the aim of monitoring and predicting the prognosis of NMSC treated by dermatologists in clinics in the central and north Denmark regions. METHODS:We assessed the completeness of registration of patients and follow-up visits, and positive...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/clep.s9959
更新日期:2010-08-09 00:00:00
abstract::Memory diseases are the most important determinant of health care service use and quality of life among older individuals. Adverse effects of medication are common among older people, but this age group is underrepresented in clinical trials. Finnish statutory health care and prescription registers, together with pers...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S46622
更新日期:2013-08-07 00:00:00
abstract:Objective:To investigate the impact of moderate wine consumption on the risk of prostate cancer (PCa). We focused on the differential effect of moderate consumption of red versus white wine. Design:This study was a meta-analysis that includes data from case-control and cohort studies. Materials and methods:A systemat...
journal_title:Clinical epidemiology
pub_type: 杂志文章,评审
doi:10.2147/CLEP.S163668
更新日期:2018-04-17 00:00:00
abstract:Background:Individuals with a family history of Parkinson's disease (PD) appear to have a higher risk of developing PD and other neuropsychiatric diseases. However, estimates of the relative risks (RRs) of PD and the roles of genetic and environmental factors in PD susceptibility are unclear. The aim of this study was ...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S164330
更新日期:2018-05-30 00:00:00
abstract:BACKGROUND:The study objective was to compare the Newcastle-Ottawa Scale (NOS) and the RTI item bank (RTI-IB) and estimate interrater agreement using the RTI-IB within a systematic review on the cardiovascular safety of glucose-lowering drugs. METHODS:We tailored both tools and added four questions to the RTI-IB. Two ...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S66677
更新日期:2014-10-10 00:00:00
abstract:Background:Primary care databases represent a rich source of data for health care research; however, the quality of recording of secondary care events in these databases is uncertain. This study sought to investigate the completeness of recording of hospital admissions for bleeds in primary care records and explore the...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S170304
更新日期:2018-09-04 00:00:00
abstract:Background:The Swedish Quality Register for Inflammatory Bowel Disease (SWIBREG) contains clinical data for the study of inflammatory bowel disease (IBD). The Epidemiology Strengthened by histoPathology Reports in Sweden (ESPRESSO) cohort was recently established for the study of gastrointestinal histopathology. We aim...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S265404
更新日期:2020-10-09 00:00:00
abstract:Objective:To evaluate the long-term risk of stroke and poststroke adverse outcomes in patients with heart failure (HF). Methods:We used research data from Taiwan's National Health Insurance Program from 2000 to 2005 and identified 20,072 adults aged ≥30 years who were newly diagnosed with HF. Frequency matching based ...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S261179
更新日期:2020-11-05 00:00:00
abstract:OBJECTIVE:We examined the association between lifestyle factors and menstrual cycle characteristics among nulliparous Danish women aged 18-40 years who were participating in an Internet-based prospective cohort study of pregnancy planners. METHODS:We used cross-sectional data collected at baseline to assess the associ...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S46712
更新日期:2013-08-19 00:00:00
abstract::Routinely-collected health data (RCD) are now used for a wide range of studies, including observational studies, comparative effectiveness research, diagnostics, studies of adverse effects, and predictive analytics. At the same time, limitations inherent in using data collected without specific a priori research quest...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S110528
更新日期:2016-10-19 00:00:00
abstract:Background:Cost-effective primary prevention of cardiovascular disease (CVD) relies on accuracy of risk assessment. Current risk scores require clinical and laboratory measures, are expensive and are often difficult to apply in the population setting. Objective:This study sought to estimate CVD risk from individuals' ...
journal_title:Clinical epidemiology
pub_type: 杂志文章
doi:10.2147/CLEP.S219708
更新日期:2020-01-14 00:00:00