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BMC Medical Research Methodology

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https://www.readbyqxmd.com/read/28441932/an-experimental-comparison-of-web-push-vs-paper-only-survey-procedures-for-conducting-an-in-depth-health-survey-of-military-spouses
#1
Hope Seib McMaster, Cynthia A LeardMann, Steven Speigle, Don A Dillman
BACKGROUND: Previous research has found that a "web-push" approach to data collection, which involves contacting people by mail to request an Internet survey response while withholding a paper response option until later in the contact process, consistently achieves lower response rates than a "paper-only" approach, whereby all respondents are contacted and requested to respond by mail. METHOD: An experiment was designed, as part of the Millennium Cohort Family Study, to compare response rates, sample representativeness, and cost between a web-push and a paper-only approach; each approach comprised 3 stages of mail contacts...
April 26, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28431517/sharp-bounds-on-sufficient-cause-interactions-under-the-assumption-of-no-redundancy
#2
Wen-Chung Lee
BACKGROUND: Sufficient-cause interaction is a type of interaction that has received much attention recently. The sufficient component cause model on which the sufficient-cause interaction is based is however a non-identifiable model. Estimating the interaction parameters from the model is mathematically impossible. METHODS: In this paper, I derive bounding formulae for sufficient-cause interactions under the assumption of no redundancy. RESULTS: Two real data sets are used to demonstrate the method (R codes provided)...
April 21, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28431516/evaluation-of-the-impact-of-disease-prevention-measures-a-methodological-note-on-defining-incidence-rates
#3
Yin-Bun Cheung, Ying Xu, Matthew Cairns, Paul Milligan
BACKGROUND: In studies of recurrent events, it is common to consider a person who has suffered a disease episode and received curative treatment to be not at risk of suffering a new episode for a duration of time. It is a common practice to deduct this duration from the person's observation time in the statistical analysis of the incidence data. METHODS: We examined the concepts of incidence and protective efficacy from a real life point of view. We developed simple formulae to show the relationship between the incidence rate and protective efficacy between analyses with and without deducting the curative treatment time from the observation time...
April 21, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28431505/using-evaluability-assessment-to-assess-local-community-development-health-programmes-a-scottish-case-study
#4
Melissa Belford, Tony Robertson, Ruth Jepson
BACKGROUND: Evaluation of the potential effectiveness of a programme's objectives (health or otherwise) is important in demonstrating how programmes work. However, evaluations are expensive and can focus on unrealistic outcomes not grounded in strong theory, especially where there is pressure to show effectiveness. The aim of this research was to demonstrate that the evaluability assessment (a cost-effective pre-evaluation tool that primarily gives quick, constructive feedback) can be used to help develop programme and outcome objectives to improve programmes while they run and to assist in producing more effective evaluations...
April 21, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28427353/assessing-the-impact-of-natural-policy-experiments-on-socioeconomic-inequalities-in-health-how-to-apply-commonly-used-quantitative-analytical-methods
#5
Yannan Hu, Frank J van Lenthe, Rasmus Hoffmann, Karen van Hedel, Johan P Mackenbach
BACKGROUND: The scientific evidence-base for policies to tackle health inequalities is limited. Natural policy experiments (NPE) have drawn increasing attention as a means to evaluating the effects of policies on health. Several analytical methods can be used to evaluate the outcomes of NPEs in terms of average population health, but it is unclear whether they can also be used to assess the outcomes of NPEs in terms of health inequalities. The aim of this study therefore was to assess whether, and to demonstrate how, a number of commonly used analytical methods for the evaluation of NPEs can be applied to quantify the effect of policies on health inequalities...
April 20, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28427350/evaluation-of-a-modified-version-of-the-posttraumatic-growth-inventory-short-form
#6
Navjot Kaur, Ben Porter, Cynthia A LeardMann, Laura E Tobin, Hector Lemus, David D Luxton
BACKGROUND: Posttraumatic growth is the positive change resulting from traumatic experiences and is typically assessed with retrospective measures like the Posttraumatic Growth Inventory (PTGI). The PTGI was designed to include reference to a specific traumatic event, making it difficult to implement, without change, in prospective survey studies. Thus, a modified Posttraumatic Growth Inventory-Short Form (PTGI-SF) was included in a large prospective study of current and former U.S. military personnel...
April 20, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28427340/does-the-association-between-adherence-to-statin-medications-and-mortality-depend-on-measurement-approach-a-retrospective-cohort-study
#7
Mhd Wasem Alsabbagh, Dean Eurich, Lisa M Lix, Thomas W Wilson, David F Blackburn
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 2008. Eligible individuals received a prescription for a statin following hospitalization for acute coronary syndrome (ACS). Adherence was measured using proportion of days covered (PDC) expressed either as: 1) a fixed summary measure, or 2) as a repeatedly measured covariate...
April 20, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28427337/treatment-seeking-behaviour-in-low-and-middle-income-countries-estimated-using-a-bayesian-model
#8
Victor A Alegana, Jim Wright, Carla Pezzulo, Andrew J Tatem, Peter M Atkinson
BACKGROUND: Seeking treatment in formal healthcare for uncomplicated infections is vital to combating disease in low- and middle-income countries (LMICs). Healthcare treatment-seeking behaviour varies within and between communities and is modified by socio-economic, demographic, and physical factors. As a result, it remains a challenge to quantify healthcare treatment-seeking behaviour using a metric that is comparable across communities. Here, we present an application for transforming individual categorical responses (actions related to fever) to a continuous probabilistic estimate of fever treatment for one country in Sub-Saharan Africa (SSA)...
April 20, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28427334/the-impact-of-the-mode-of-survey-administration-on-estimates-of-daily-smoking-for-mobile-phone-only-users
#9
Joseph Hanna, Damien V Cordery, David G Steel, Walter Davis, Timothy C Harrold
BACKGROUND: Over the past decade, there have been substantial changes in landline and mobile phone ownership, with a substantial increase in the proportion of mobile-only households. Estimates of daily smoking rates for the mobile phone only (MPO) population have been found to be substantially higher than the rest of the population and telephone surveys that use a dual sampling frame (landline and mobile phones) are now considered best practice. Smoking is seen as an undesirable behaviour; measuring such behaviours using an interviewer may lead to lower estimates when using telephone based surveys compared to self-administered approaches...
April 20, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28420349/grey-literature-in-systematic-reviews-a-cross-sectional-study-of-the-contribution-of-non-english-reports-unpublished-studies-and-dissertations-to-the-results-of-meta-analyses-in-child-relevant-reviews
#10
Lisa Hartling, Robin Featherstone, Megan Nuspl, Kassi Shave, Donna M Dryden, Ben Vandermeer
BACKGROUND: Systematic reviews (SRs) are an important source of information about healthcare interventions. A key component of a well-conducted SR is a comprehensive literature search. There is limited evidence on the contribution of non-English reports, unpublished studies, and dissertations and their impact on results of meta-analyses. METHODS: Our sample included SRs from three Cochrane Review Groups: Acute Respiratory Infections (ARI), Infectious Diseases (ID), Developmental Psychosocial and Learning Problems (DPLP) (nā€‰=ā€‰129)...
April 19, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28420347/kappa-statistic-to-measure-agreement-beyond-chance-in-free-response-assessments
#11
Marc Carpentier, Christophe Combescure, Laura Merlini, Thomas V Perneger
BACKGROUND: The usual kappa statistic requires that all observations be enumerated. However, in free-response assessments, only positive (or abnormal) findings are notified, but negative (or normal) findings are not. This situation occurs frequently in imaging or other diagnostic studies. We propose here a kappa statistic that is suitable for free-response assessments. METHOD: We derived the equivalent of Cohen's kappa statistic for two raters under the assumption that the number of possible findings for any given patient is very large, as well as a formula for sampling variance that is applicable to independent observations (for clustered observations, a bootstrap procedure is proposed)...
April 19, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28420342/impact-of-correlation-of-predictors-on-discrimination-of-risk-models-in-development-and-external-populations
#12
Suman Kundu, Madhu Mazumdar, Bart Ferket
BACKGROUND: The area under the ROC curve (AUC) of risk models is known to be influenced by differences in case-mix and effect size of predictors. The impact of heterogeneity in correlation among predictors has however been under investigated. We sought to evaluate how correlation among predictors affects the AUC in development and external populations. METHODS: We simulated hypothetical populations using two different methods based on means, standard deviations, and correlation of two continuous predictors...
April 19, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28420339/protocol-for-the-development-of-a-salutogenic-intrapartum-core-outcome-set-sipcos
#13
Valerie Smith, Deirdre Daly, Ingela Lundgren, Tine Eri, Cecily Begley, Mechthild M Gross, Soo Downe, Zarko Alfirevic, Declan Devane
BACKGROUND: Maternity intrapartum care research and clinical care more often focus on outcomes that minimise or prevent adverse health rather than on what constitutes positive health and wellbeing (salutogenesis). This was highlighted recently in a systematic review of reviews of intrapartum reported outcomes where only 8% of 1648 individual outcomes, from 102 systematic reviews, were agreed as being salutogenically-focused. Added to this is variation in the outcomes measured in individual studies rendering it very difficult for researchers to synthesise, fully, the evidence from studies on a particular topic...
April 19, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28420338/review-and-evaluation-of-performance-measures-for-survival-prediction-models-in-external-validation-settings
#14
M Shafiqur Rahman, Gareth Ambler, Babak Choodari-Oskooei, Rumana Z Omar
BACKGROUND: When developing a prediction model for survival data it is essential to validate its performance in external validation settings using appropriate performance measures. Although a number of such measures have been proposed, there is only limited guidance regarding their use in the context of model validation. This paper reviewed and evaluated a wide range of performance measures to provide some guidelines for their use in practice. METHODS: An extensive simulation study based on two clinical datasets was conducted to investigate the performance of the measures in external validation settings...
April 18, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28415991/clinical-patient-registry-recruitment-and-retention-a-survey-of-patients-in-two-chronic-disease-registries
#15
Daniel H Solomon, Nancy A Shadick, Michael E Weinblatt, Michelle Frits, Christine Iannaccone, Agnes Zak, Joshua R Korzenik
BACKGROUND: The collection of routine clinical data in the setting of research registries can serve an important role in understanding real world care. However, relatively little is known about the patient experience in registries, motivating us to survey patients enrolled in two chronic disease registries. METHODS: We conducted similar surveys in two disease-based registries based at one academic medical center in the US. One group of patients with rheumatoid arthritis (RA) had been enrolled in a registry, and we focused on retention factors...
April 17, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28410588/evidence-synthesis-to-inform-model-based-cost-effectiveness-evaluations-of-diagnostic-tests-a-methodological-review-of-health-technology-assessments
#16
Bethany Shinkins, Yaling Yang, Lucy Abel, Thomas R Fanshawe
BACKGROUND: Evaluations of diagnostic tests are challenging because of the indirect nature of their impact on patient outcomes. Model-based health economic evaluations of tests allow different types of evidence from various sources to be incorporated and enable cost-effectiveness estimates to be made beyond the duration of available study data. To parameterize a health-economic model fully, all the ways a test impacts on patient health must be quantified, including but not limited to diagnostic test accuracy...
April 14, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28410585/practical-application-of-opt-out-recruitment-methods-in-two-health-services-research-studies
#17
Christopher J Miller, James F Burgess, Ellen P Fischer, Deborah J Hodges, Lindsay K Belanger, Jessica M Lipschitz, Siena R Easley, Christopher J Koenig, Regina L Stanley, Jeffrey M Pyne
BACKGROUND: Participant recruitment is an ongoing challenge in health research. Recruitment may be especially difficult for studies of access to health care because, even among those who are in care, people using services least often also may be hardest to contact and recruit. Opt-out recruitment methods (in which potential participants are given the opportunity to decline further contact about the study (opt out) following an initial mailing, and are then contacted directly if they have not opted out within a specified period) can be used for such studies...
April 14, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28410581/statistical-evaluation-of-adding-multiple-risk-factors-improves-framingham-stroke-risk-score
#18
Xiao-Hua Zhou, Xiaonan Wang, Ashlee Duncan, Guizhou Hu, Jiayin Zheng
BACKGROUND: Framingham Stroke Risk Score (FSRS) is the most well-regarded risk appraisal tools for evaluating an individual's absolute risk on stroke onset. However, several widely accepted risk factors for stroke were not included in the original Framingham model. This study proposed a new model which combines an existing risk models with new risk factors using synthesis analysis, and applied it to the longitudinal Atherosclerosis Risk in Communities (ARIC) data set. METHODS: Risk factors in original prediction models and new risk factors in proposed model had been discussed...
April 14, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28403811/estimating-the-standardized-incidence-ratio-sir-with-incomplete-follow-up-data
#19
Heiko Becher, Volker Winkler
BACKGROUND: A standard parameter to compare the disease incidence of a cohort relative to the population is the standardized incidence ratio (SIR). For statistical inference is commonly assumed that the denominator, the expected number of cases, is fixed. If a disease registry is available, incident cases can sometimes be identified by linkage with the registry, however, registries may not contain information on migration or death from other causes. A complete follow-up with a population registry may not be possible...
April 12, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28399821/comparison-of-surveillance-based-metrics-for-the-assessment-and-monitoring-of-disease-detection-simulation-study-about-type-2-diabetes
#20
Ralph Brinks, Annika Hoyer, Deborah B Rolka, Oliver Kuss, Edward W Gregg
BACKGROUND: Screening and detection of cases are a common public health priority for treatable chronic conditions with long subclinical periods. However, the validity of commonly-used metrics from surveillance systems for rates of detection (or case-finding) have not been evaluated. METHODS: Using data from a Danish diabetes register and a recently developed illness-death model of chronic diseases with subclinical conditions, we simulate two scenarios of different performance of case-finding...
April 11, 2017: BMC Medical Research Methodology
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