Integrating and extending cohort studies: lessons from the eXtending Treatments, Education and Networks in Depression (xTEND) study.

abstract：BACKGROUND:Disease registers aim to collect information about all instances of a disease or condition in a defined population of individuals. Traditionally methods of operating disease registers have required that notifications of cases be identified by unique identifiers such as social security number or national iden...

journal_title：BMC medical research methodology

authors： Churches T

更新日期：2003-01-06 00:00:00

abstract：BACKGROUND:Clinical practice guidelines have become increasingly widely used to guide quality improvement of clinical practice. Qualitative research may be a useful way to improve the quality and implementation of guidelines. The methodology for qualitative evidence used in guidelines development is worthy of further r...

journal_title：BMC medical research methodology

authors： Wang YY,Liang DD,Lu C,Shi YX,Zhang J,Cao Y,Fang C,Huang D,Jin YH

更新日期：2020-06-17 00:00:00

abstract：BACKGROUND:General Practitioners (GPs) respond poorly to postal surveys. Consequently there is potential for reduced data quality and bias in the findings. In general population surveys, response to postal questionnaires may be improved by reducing their length and offering incentives. The aim of this study was to inve...

journal_title：BMC medical research methodology

authors： Cottrell E,Roddy E,Rathod T,Thomas E,Porcheret M,Foster NE

更新日期：2015-01-06 00:00:00

abstract：BACKGROUND:Multi-centre randomized controlled clinical trials play an important role in modern evidence-based medicine. Advantages of collecting data from more than one site are numerous, including accelerated recruitment and increased generalisability of results. Mixed models can be applied to account for potential cl...

journal_title：BMC medical research methodology

authors： Harden M,Friede T

更新日期：2018-11-29 00:00:00

abstract：BACKGROUND:Claims databases are generally considered inadequate for obesity research due to suboptimal capture of body mass index (BMI) measurements. This might not be true for bariatric surgery because of reimbursement requirements and changes in coding systems. We assessed the availability and validity of claims-base...

journal_title：BMC medical research methodology

authors： Li X,Lewis KH,Callaway K,Wharam JF,Toh S

更新日期：2020-09-07 00:00:00

abstract：BACKGROUND:Although a variety of instruments are available that capture stress experience, the assessment of chronic stress has been hindered by the lack of economical screening instruments. Recently, an English-language version of the Trier Inventory for Chronic Stress (TICS-EN) consisting of 57 items according to a s...

journal_title：BMC medical research methodology

authors： Petrowski K,Braehler E,Schmalbach B,Hinz A,Bastianon C,Ritz T

更新日期：2020-12-16 00:00:00

abstract：BACKGROUND:The aim of this study was to examine the relationship between mortality and statin adherence using two different approaches to adherence measurement (summary versus repeated-measures). METHODS:A retrospective cohort study was conducted using administrative data from Saskatchewan, Canada between 1994 and 200...

journal_title：BMC medical research methodology

authors： Alsabbagh MW,Eurich D,Lix LM,Wilson TW,Blackburn DF

更新日期：2017-04-20 00:00:00

abstract：BACKGROUND:Diet plays an important role in chronic disease, and the use of dietary pattern analysis has grown rapidly as a way of deconstructing the complexity of nutritional intake and its relation to health. Pattern analysis methods, such as principal component analysis (PCA), have been used to investigate various di...

journal_title：BMC medical research methodology

authors： Zhang F,Tapera TM,Gou J

更新日期：2018-10-29 00:00:00

abstract：BACKGROUND:Within cancer care, dynamic evaluations of the loss in expectation of life provides useful information to patients as well as physicians. The loss of lifetime function yields the conditional loss in expectation of life given survival up to a specific time point. Due to the inevitable censoring in time-to-eve...

journal_title：BMC medical research methodology

authors： Jakobsen LH,Andersson TM,Biccler JL,El-Galaly TC,Bøgsted M

更新日期：2019-01-28 00:00:00

abstract：BACKGROUND:Studies examining incident heart failure (HF) have been limited to select populations. To examine incident HF with broader generalizability, there is need to assemble a HF-free cohort using a geographically-diverse sample. We aimed to develop and validate a simple medication-based strategy for assembling a H...

journal_title：BMC medical research methodology

authors： Goyal P,Mefford MT,Chen L,Sterling MR,Durant RW,Safford MM,Levitan EB

更新日期：2020-03-04 00:00:00

abstract：BACKGROUND:Diagnostic problems in clinical trials are sometimes ordinal. For example, colon tumor staging was performed according to the TNM classification. However, clinical data are limited by markedly small sample sizes in some stage. METHODS:We propose a distribution-free test for detecting ordered alternatives in...

journal_title：BMC medical research methodology

authors： Chang CH,Chin CC,Yu WW,Huang YY

更新日期：2013-12-05 00:00:00

abstract：BACKGROUND:Measuring body mass index (BMI) has been proposed as a method of screening for preventive primary care and population surveillance of childhood obesity. However, the accuracy of routinely collected measurements has been questioned. The purpose of this study was to assess the reliability of height, length and...

journal_title：BMC medical research methodology

authors： Carsley S,Parkin PC,Tu K,Pullenayegum E,Persaud N,Maguire JL,Birken CS,TARGet Kids! Collaboration.

更新日期：2019-04-24 00:00:00

abstract：BACKGROUND:This research aims to explore an identified gap in implementation science methodology, that is, how to assess context in implementation research. Context is among the strongest influences on implementation success but is a construct that is poorly understood and reported within the literature. Consequently, ...

journal_title：BMC medical research methodology

authors： Rogers L,De Brún A,McAuliffe E

更新日期：2020-06-15 00:00:00

abstract：BACKGROUND:Action research (AR) and randomized controlled trials (RCTs) are usually considered to be theoretically and practically incompatible. However, we argue that their respective strengths and weaknesses can be complementary. We illustrate our argument from a recent study assessing the effect of telemonitoring on...

journal_title：BMC medical research methodology

authors： Day K,Kenealy TW,Sheridan NF

更新日期：2016-06-08 00:00:00

abstract：BACKGROUND:The rationale for commissioning community pulmonary rehabilitation programmes is based on evidence from randomised clinical trials. However, there are a number of reasons why similar programmes might be less effective outside the environment of a clinical trial. These include a less highly selected patient g...

journal_title：BMC medical research methodology

authors： Goyder EC,Strong M,Green A,Holmes MW,Miles G,Reddington O,Lawson R,Lee A,Basran G

更新日期：2013-08-13 00:00:00

abstract：BACKGROUND:This paper discusses whether baseline demographic, socio-economic, health variables, length of follow-up and method of contacting the participants predict non-response to the invitation for a second assessment of lifestyle factors and body weight in the European multi-center EPIC-PANACEA study. METHODS:Over...

journal_title：BMC medical research methodology

authors： May AM,Adema LE,Romaguera D,Vergnaud AC,Agudo A,Ekelund U,Steffen A,Orfanos P,Slimani N,Rinaldi S,Mouw T,Rohrmann S,Hermann S,Boeing H,Bergmann MM,Jakobsen MU,Overvad K,Wareham NJ,Gonzalez C,Tjonneland A,Halkjaer

更新日期：2012-09-24 00:00:00

abstract：BACKGROUND:In order to accurately measure and monitor levels of moderate-to-vigorous physical activity (MVPA) and sedentary behaviour (SB) in older adults, cost efficient and valid instruments are required. To date, the International Physical Activity Questionnaire (IPAQ) has not been validated with older adults (aged ...

journal_title：BMC medical research methodology

authors： Cleland C,Ferguson S,Ellis G,Hunter RF

更新日期：2018-12-22 00:00:00

abstract：:The recently published "COSMIN" guidelines aim to rate properties of outcome instruments and state two issues with regard to responsiveness which is the instrument's ability to detect change over time. These issues are comparison of score changes with change of an external criterion using correlations and the judgemen...

journal_title：BMC medical research methodology

authors： Angst F

更新日期：2011-11-18 00:00:00

abstract：BACKGROUND:Cross-cultural research with patient-reported outcomes measures (PROMs) assumes that the PROM in the target language will measure the same construct in the same way as the PROM in the source language. Yet translation methods are rarely used to qualitatively maximise construct equivalence or to describe the i...

journal_title：BMC medical research methodology

authors： Hawkins M,Cheng C,Elsworth GR,Osborne RH

更新日期：2020-05-26 00:00:00

abstract：BACKGROUND:In many studies the information of patients who are dying in the hospital is censored when examining the change in length of hospital stay (cLOS) due to hospital-acquired infections (HIs). While appropriate estimators of cLOS are available in literature, the existence of the bias due to censoring of deaths w...

journal_title：BMC medical research methodology

authors： Rahman S,von Cube M,Schumacher M,Wolkewitz M

更新日期：2018-05-30 00:00:00

abstract：BACKGROUND:Evidence-based health care is informed by results of randomized clinical trials (RCTs) and their syntheses in meta-analyses. When the trial outcomes measured are not clearly described in trial publications, knowledge synthesis, translation, and decision-making may be impeded. While heterogeneity in outcomes ...

journal_title：BMC medical research methodology

authors： Monsour A,Mew EJ,Patel S,Chee-A-Tow A,Saeed L,Santos L,Courtney DB,Watson PN,Monga S,Szatmari P,Offringa M,Butcher NJ

更新日期：2020-05-25 00:00:00

abstract：BACKGROUND:There are detailed reviews about different recruitment strategies, but not with regard to differences between recruitment of hospital-based versus office-based physicians. Within this study, the two different recruitment schemes are compared. Advantages and disadvantages of different ways of recruitment in r...

journal_title：BMC medical research methodology

authors： Zeissig SR,Weyer-Elberich V,Emrich K,Binder H,Fischbeck S,Imruck BH,Friedrich-Mai P,Beutel ME,Blettner M

更新日期：2017-11-22 00:00:00

abstract：BACKGROUND:To describe how frequently harm is reported in the abstract of high impact factor medical journals. METHODS: DESIGN AND POPULATION:We carried out a blinded structured review of a random sample of 363 Randomised Controlled Trials (RCTs) carried out on human beings, and published in high impact factor medica...

journal_title：BMC medical research methodology

authors： Bernal-Delgado E,Fisher ES

更新日期：2008-03-27 00:00:00

abstract：BACKGROUND:Researchers and policy makers have determined that accounting for productivity costs, or "indirect costs," may be as important as including direct medical expenditures when evaluating the societal value of health interventions. These costs are also important when estimating the global burden of disease. The ...

journal_title：BMC medical research methodology

authors： Menzin J,Marton JP,Menzin JA,Willke RJ,Woodward RM,Federico V

更新日期：2012-06-25 00:00:00

abstract：BACKGROUND:Postal questionnaires are widely used to collect outcome data on participants. However, a poor response to questionnaires will reduce the statistical power of the study and may introduce bias. A meta analysis of ten trials offering study results, largely in the fields of education and marketing, was shown to...

journal_title：BMC medical research methodology

authors： Cockayne S,Torgerson DJ

更新日期：2005-10-26 00:00:00

abstract：BACKGROUND:How overall physical activity relates to specific activities and how reported activity changes over time may influence interpretation of observed associations between physical activity and health. We examine the relationships between various physical activities self-reported at different times in a large coh...

journal_title：BMC medical research methodology

authors： Armstrong ME,Cairns BJ,Green J,Reeves GK,Beral V,Million Women Study Collaborators.

更新日期：2011-06-22 00:00:00

abstract：BACKGROUND:Primary-care based randomized controlled trials (RCTs) build an important evidence base for general practice but little evidence exists about barriers to recruitment which often hamper such trials. We investigated the issues that impeded and facilitated recruitment to a clinical trial in general practice. M...

journal_title：BMC medical research methodology

authors： Foster JM,Sawyer SM,Smith L,Reddel HK,Usherwood T

更新日期：2015-03-12 00:00:00

abstract：BACKGROUND:Nowadays, more and more clinical scales consisting in responses given by the patients to some items (Patient Reported Outcomes - PRO), are validated with models based on Item Response Theory, and more specifically, with a Rasch model. In the validation sample, presence of missing data is frequent. The aim of...

journal_title：BMC medical research methodology

authors： Hardouin JB,Conroy R,Sébille V

更新日期：2011-07-14 00:00:00

abstract：BACKGROUND:The prevailing view in therapeutic clinical research today is that observational studies are useful for generating new hypotheses and that controlled experiments (i.e., randomized clinical trials, RCTs) are the most appropriate method for assessing and confirming the efficacy of interventions. DISCUSSION:Th...

journal_title：BMC medical research methodology

authors： Sacristán JA

更新日期：2011-04-25 00:00:00

abstract：BACKGROUND:Longitudinal studies using data collected as part of usual care risk providing biased results if visit times are related to the outcome of interest. Statistical methods for mitigating this bias are available but rarely used. This lack of use could be attributed to a lack of need or to a lack of awareness of ...

journal_title：BMC medical research methodology

authors： Farzanfar D,Abumuamar A,Kim J,Sirotich E,Wang Y,Pullenayegum E

更新日期：2017-09-06 00:00:00