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  1. Research article

    Double-adjustment in propensity score matching analysis: choosing a threshold for considering residual imbalance

    Double-adjustment can be used to remove confounding if imbalance exists after propensity score (PS) matching. However, it is not always possible to include all covariates in adjustment. We aimed to find the op...

    Tri-Long Nguyen, Gary S. Collins, Jessica Spence, Jean-Pierre Daurès, P. J. Devereaux, Paul Landais and Yannick Le Manach

    BMC Medical Research Methodology 2017 17:78

    Published on: 28 April 2017

  2. Research article

    Sample size and power determination when limited preliminary information is available

    We describe a novel strategy for power and sample size determination developed for studies utilizing investigational technologies with limited available preliminary data, specifically of imaging biomarkers. We...

    Christine E. McLaren, Wen-Pin Chen, Thomas D. O’Sullivan, Daniel L. Gillen, Min-Ying Su, Jeon H. Chen and Bruce J. Tromberg

    BMC Medical Research Methodology 2017 17:75

    Published on: 26 April 2017

  3. Research article

    The effectiveness of a monetary incentive offer on survey response rates and response completeness in a longitudinal study

    Achieving adequate response rates is an ongoing challenge for longitudinal studies. The World Trade Center Health Registry is a longitudinal health study that periodically surveys a cohort of ~71,000 people ex...

    Shengchao Yu, Howard E. Alper, Angela-Maithy Nguyen, Robert M. Brackbill, Lennon Turner, Deborah J. Walker, Carey B. Maslow and Kimberly C. Zweig

    BMC Medical Research Methodology 2017 17:77

    Published on: 26 April 2017

  4. Research article

    An experimental comparison of web-push vs. paper-only survey procedures for conducting an in-depth health survey of military spouses

    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 ...

    Hope Seib McMaster, Cynthia A. LeardMann, Steven Speigle and Don A. Dillman

    BMC Medical Research Methodology 2017 17:73

    Published on: 26 April 2017

  5. Technical advance

    Assessing the complexity of interventions within systematic reviews: development, content and use of a new tool (iCAT_SR)

    Health interventions fall along a spectrum from simple to more complex. There is wide interest in methods for reviewing ‘complex interventions’, but few transparent approaches for assessing intervention comple...

    Simon Lewin, Maggie Hendry, Jackie Chandler, Andrew D. Oxman, Susan Michie, Sasha Shepperd, Barnaby C. Reeves, Peter Tugwell, Karin Hannes, Eva A. Rehfuess, Vivien Welch, Joanne E. Mckenzie, Belinda Burford, Jennifer Petkovic, Laurie M. Anderson, Janet Harris…

    BMC Medical Research Methodology 2017 17:76

    Published on: 26 April 2017

  6. Research article

    Measurement properties of the Danish version of the Awareness and Beliefs about Cancer (ABC) measure

    The International Cancer Benchmarking Partnership aims to study international differences in cancer survival and the possible causes. Participating countries are Australia, Canada, Norway, Sweden, Denmark and ...

    Line Hvidberg, Anette Fischer Pedersen, Christian Nielsen Wulff, Anders Helles Carlsen and Peter Vedsted

    BMC Medical Research Methodology 2017 17:74

    Published on: 26 April 2017

  7. Research article

    Assessing the impact of natural policy experiments on socioeconomic inequalities in health: how to apply commonly used quantitative analytical methods?

    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. ...

    Yannan Hu, Frank J. van Lenthe, Rasmus Hoffmann, Karen van Hedel and Johan P. Mackenbach

    BMC Medical Research Methodology 2017 17:68

    Published on: 20 April 2017

  8. Research article

    Does the association between adherence to statin medications and mortality depend on measurement approach? A retrospective cohort study

    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).

    Mhd. Wasem Alsabbagh, Dean Eurich, Lisa M. Lix, Thomas W. Wilson and David F. Blackburn

    BMC Medical Research Methodology 2017 17:66

    Published on: 20 April 2017

  9. Research article

    Evaluation of a modified version of the Posttraumatic Growth Inventory-Short Form

    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 i...

    Navjot Kaur, Ben Porter, Cynthia A. LeardMann, Laura E. Tobin, Hector Lemus and David D. Luxton

    BMC Medical Research Methodology 2017 17:69

    Published on: 20 April 2017

  10. Research article

    The impact of the mode of survey administration on estimates of daily smoking for mobile phone only users

    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 t...

    Joseph Hanna, Damien V. Cordery, David G. Steel, Walter Davis and Timothy C. Harrold

    BMC Medical Research Methodology 2017 17:65

    Published on: 20 April 2017

  11. Study protocol

    Protocol for the development of a salutogenic intrapartum core outcome set (SIPCOS)

    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 wa...

    Valerie Smith, Deirdre Daly, Ingela Lundgren, Tine Eri, Cecily Begley, Mechthild M. Gross, Soo Downe, Zarko Alfirevic and Declan Devane

    BMC Medical Research Methodology 2017 17:61

    Published on: 19 April 2017

  12. Research article

    Kappa statistic to measure agreement beyond chance in free-response assessments

    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...

    Marc Carpentier, Christophe Combescure, Laura Merlini and Thomas V. Perneger

    BMC Medical Research Methodology 2017 17:62

    Published on: 19 April 2017

  13. Research article

    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

    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 con...

    Lisa Hartling, Robin Featherstone, Megan Nuspl, Kassi Shave, Donna M. Dryden and Ben Vandermeer

    BMC Medical Research Methodology 2017 17:64

    Published on: 19 April 2017

  14. Research article

    Review and evaluation of performance measures for survival prediction models in external validation settings

    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 ...

    M. Shafiqur Rahman, Gareth Ambler, Babak Choodari-Oskooei and Rumana Z. Omar

    BMC Medical Research Methodology 2017 17:60

    Published on: 18 April 2017

  15. Research article

    Clinical patient registry recruitment and retention: a survey of patients in two chronic disease registries

    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 r...

    Daniel H. Solomon, Nancy A. Shadick, Michael E. Weinblatt, Michelle Frits, Christine Iannaccone, Agnes Zak and Joshua R. Korzenik

    BMC Medical Research Methodology 2017 17:59

    Published on: 17 April 2017

  16. Research article

    Evidence synthesis to inform model-based cost-effectiveness evaluations of diagnostic tests: a methodological review of health technology assessments

    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 vario...

    Bethany Shinkins, Yaling Yang, Lucy Abel and Thomas R. Fanshawe

    BMC Medical Research Methodology 2017 17:56

    Published on: 14 April 2017

  17. Research article

    Practical application of opt-out recruitment methods in two health services research studies

    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...

    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 and Jeffrey M. Pyne

    BMC Medical Research Methodology 2017 17:57

    Published on: 14 April 2017

  18. Research Article

    Comparison of surveillance-based metrics for the assessment and monitoring of disease detection: simulation study about type 2 diabetes

    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...

    Ralph Brinks, Annika Hoyer, Deborah B. Rolka, Oliver Kuss and Edward W. Gregg

    BMC Medical Research Methodology 2017 17:54

    Published on: 11 April 2017

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