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  1. In biometric practice, researchers often apply a large number of different methods in a "trial-and-error" strategy to get as much as possible out of their data and, due to publication pressure or pressure from...

    Authors: Anne-Laure Boulesteix and Carolin Strobl
    Citation: BMC Medical Research Methodology 2009 9:85
  2. The data from longitudinal complex surveys based on multi-stage sampling designs contain cross-sectional dependencies among units due to clustered nature of the data and within-subject dependencies due to repe...

    Authors: Punam Pahwa and Chandima P Karunanayake
    Citation: BMC Medical Research Methodology 2009 9:84
  3. Development of three classification trees (CT) based on the CART (Classification and Regression Trees), CHAID (Chi-Square Automatic Interaction Detection) and C4.5 methodologies for the calculation of probability...

    Authors: Javier Trujillano, Mariona Badia, Luis Serviá, Jaume March and Angel Rodriguez-Pozo
    Citation: BMC Medical Research Methodology 2009 9:83
  4. Health researchers undertake studies which combine qualitative and quantitative methods. Little attention has been paid to the structural issues affecting this mixed methods approach. We explored the facilitat...

    Authors: Alicia O'Cathain, Jon Nicholl and Elizabeth Murphy
    Citation: BMC Medical Research Methodology 2009 9:82
  5. US Latinos have greater prevalence of type 2 diabetes (diabetes), uncontrolled diabetes and diabetes co-morbidities compared to non-Latino Whites. They also have lower literacy levels and are more likely to li...

    Authors: Milagros C Rosal, Mary Jo White, Angela Restrepo, Barbara Olendzki, Jeffrey Scavron, Elise Sinagra, Ira S Ockene, Michael Thompson, Stephenie C Lemon, Lucy M Candib and George Reed
    Citation: BMC Medical Research Methodology 2009 9:81
  6. Meta-analysis is increasingly used as a key source of evidence synthesis to inform clinical practice. The theory and statistical foundations of meta-analysis continually evolve, providing solutions to many new...

    Authors: Byron C Wallace, Christopher H Schmid, Joseph Lau and Thomas A Trikalinos
    Citation: BMC Medical Research Methodology 2009 9:80
  7. The validity of research synthesis is threatened if published studies comprise a biased selection of all studies that have been conducted. We conducted a meta-analysis to ascertain the strength and consistency...

    Authors: Fujian Song, Sheetal Parekh-Bhurke, Lee Hooper, Yoon K Loke, Jon J Ryder, Alex J Sutton, Caroline B Hing and Ian Harvey
    Citation: BMC Medical Research Methodology 2009 9:79
  8. Randomised, placebo-controlled trials are needed to provide evidence demonstrating safe, effective interventions that reduce falls and fractures in the elderly. The quality of a clinical trial is dependent on ...

    Authors: Kerrie M Sanders, Amanda L Stuart, Elizabeth N Merriman, Meaghan L Read, Mark A Kotowicz, Doris Young, Roderick Taylor, Ian Blair-Holt, Alistair G Mander and Geoffrey C Nicholson
    Citation: BMC Medical Research Methodology 2009 9:78
  9. A 24-day regimen of contraceptive doses of drospirenone and ethinylestradiol (DRSP/EE 24d) was recently launched. This regimen has properties which may be beneficial for certain user populations (e.g., women s...

    Authors: Juergen C Dinger, Kristina Bardenheuer and Anita Assmann
    Citation: BMC Medical Research Methodology 2009 9:77
  10. Collection of buccal cells from saliva for DNA extraction offers a less invasive and convenient alternative to venipuncture blood collection that may increase participation in genetic epidemiologic studies. Ho...

    Authors: Parveen Bhatti, Diane Kampa, Bruce H Alexander, Christopher McClure, Danny Ringer, Michele M Doody and Alice J Sigurdson
    Citation: BMC Medical Research Methodology 2009 9:76
  11. In Sub-Sahara Africa, malaria due to Plasmodium falciparum is the main cause of ill health. Evaluation of malaria interventions, such as drugs and vaccines depends on clinical definition of the disease, which is ...

    Authors: Bruno P Mmbando, John P Lusingu, Lasse S Vestergaard, Martha M Lemnge, Thor G Theander and Thomas H Scheike
    Citation: BMC Medical Research Methodology 2009 9:75
  12. Diagnostic images are often assessed for clinical outcomes using subjective methods, which are limited by the skill of the reviewer. Computer-aided diagnosis (CAD) algorithms that assist reviewers in their dec...

    Authors: Alison G Abraham, Donald D Duncan, Stephen J Gange and Sheila West
    Citation: BMC Medical Research Methodology 2009 9:74
  13. Bivariate random effects meta-analysis of diagnostic tests is becoming a well established approach when studies present one two-by-two table or one pair of sensitivity and specificity. When studies present mul...

    Authors: Taye H Hamza, Lidia R Arends, Hans C van Houwelingen and Theo Stijnen
    Citation: BMC Medical Research Methodology 2009 9:73
  14. Clinical trial and epidemiological studies need high quality biospecimens from a representative sample of participants to investigate genetic influences on treatment response and disease. Obtaining blood biosp...

    Authors: Denise M Nishita, Lisa M Jack, Mary McElroy, Jennifer B McClure, Julie Richards, Gary E Swan and Andrew W Bergen
    Citation: BMC Medical Research Methodology 2009 9:71
  15. Selecting patient cohorts is a critical, iterative, and often time-consuming aspect of studies involving human subjects; informatics tools for helping streamline the process have been identified as important i...

    Authors: Vikrant G Deshmukh, Stéphane M Meystre and Joyce A Mitchell
    Citation: BMC Medical Research Methodology 2009 9:70
  16. Meeting recruitment goals is challenging for many clinical trials conducted in primary care populations. Little is known about how the use of different recruitment strategies affects the types of individuals c...

    Authors: Karen J Sherman, Rene J Hawkes, Laura Ichikawa, Daniel C Cherkin, Richard A Deyo, Andrew L Avins and Partap S Khalsa
    Citation: BMC Medical Research Methodology 2009 9:69
  17. Over the past two decades, there has been a substantial growth in the body of literature on frailty in older persons. However, there is no consensus on its definition or the criteria used to identify frailty. ...

    Authors: Sathya Karunananthan, Christina Wolfson, Howard Bergman, François Béland and David B Hogan
    Citation: BMC Medical Research Methodology 2009 9:68
  18. Quantitative survey of research articles, as an application of bibliometrics, is an effective tool for grasping overall trends in various medical research fields. This type of survey has been also applied to i...

    Authors: Hiromi Takahashi-Omoe, Katsuhiko Omoe and Nobuhiko Okabe
    Citation: BMC Medical Research Methodology 2009 9:67
  19. Due to early colonoscopy for some participants, interval-censored observations can be introduced into the data of a colorectal polyp prevention trial. The censoring could be dependent of risk of recurrence if ...

    Authors: Chiu-Hsieh Hsu, Qi Long and David S Alberts
    Citation: BMC Medical Research Methodology 2009 9:66
  20. Recruiting to primary care studies is complex. With the current drive to increase numbers of patients involved in primary care studies, we need to know more about successful recruitment approaches. There is li...

    Authors: Jane V Dyas, Tanefa Apekey, Michelle Tilling and A Niroshan Siriwardena
    Citation: BMC Medical Research Methodology 2009 9:65
  21. Multiple regression models are used in a wide range of scientific disciplines and automated model selection procedures are frequently used to identify independent predictors. However, determination of relative...

    Authors: Joseph Beyene, Eshetu G Atenafu, Jemila S Hamid, Teresa To and Lillian Sung
    Citation: BMC Medical Research Methodology 2009 9:64
  22. Epidemiological and clinical studies, often including anthropometric measures, have established obesity as a major risk factor for the development of type 2 diabetes. Appropriate cut-off values for anthropomet...

    Authors: Jens Klotsche, Dietmar Ferger, Lars Pieper, Jürgen Rehm and Hans-Ulrich Wittchen
    Citation: BMC Medical Research Methodology 2009 9:63
  23. Accurate estimates of incidence and prevalence of the disease is a vital step toward appropriate interventions for chronic disease like diabetes. A growing body of scientific literature is now available on pro...

    Authors: Shabnam Asghari, Josiane Courteau, André C Carpentier and Alain Vanasse
    Citation: BMC Medical Research Methodology 2009 9:62
  24. This article describes the challenges a research team experienced recruiting physicians within a randomised controlled trial about leg ulcer care that seeks to foster the cooperation between the medical and nu...

    Authors: Oliver R Herber, Wilfried Schnepp and Monika A Rieger
    Citation: BMC Medical Research Methodology 2009 9:61
  25. Aboriginal Australians experience poorer outcomes, and are 2.5 times more likely to die from cancer than non-Aboriginal people, even after adjustment for stage of diagnosis, cancer treatment and comorbidities....

    Authors: Shaouli Shahid, Dawn Bessarab, Peter Howat and Sandra C Thompson
    Citation: BMC Medical Research Methodology 2009 9:60
  26. Accurate measures of physical activity are highly needed. We evaluated the test-retest reliability and construct validity of the self-report Activity Questionnaire for Adults and Adolescents (AQuAA). The AQuAA...

    Authors: Mai JM Chinapaw, Sander M Slootmaker, Albertine J Schuit, Mariska van Zuidam and Willem van Mechelen
    Citation: BMC Medical Research Methodology 2009 9:58
  27. Multiple imputation (MI) provides an effective approach to handle missing covariate data within prognostic modelling studies, as it can properly account for the missing data uncertainty. The multiply imputed d...

    Authors: Andrea Marshall, Douglas G Altman, Roger L Holder and Patrick Royston
    Citation: BMC Medical Research Methodology 2009 9:57
  28. Innovations to be deployed during consultations with patients may influence the clinical performance of the medical practitioner. This study examined the impact on General Practitioners' (GPs) consultation per...

    Authors: Moyez Jiwa, Robert K McKinley, Katrina Spilsbury, Hayley Arnet and Marthe Smith
    Citation: BMC Medical Research Methodology 2009 9:54
  29. Rankings based on outcome are often used to present health care provider performance. These rankings do however not reflect that part of the variation in outcome between providers is caused by natural variatio...

    Authors: Hester F Lingsma, Marinus JC Eijkemans and Ewout W Steyerberg
    Citation: BMC Medical Research Methodology 2009 9:53
  30. Community-based recruitment is challenging particularly if the sampling frame is not easily defined as in the case of people who drink rainwater. Strategies for contacting participants must be carefully consid...

    Authors: Shelly Rodrigo, Martha Sinclair, David Cunliffe and Karin Leder
    Citation: BMC Medical Research Methodology 2009 9:51
  31. Observational outcome studies of patients with obstructive sleep apnea (OSA) require adjustment for co-morbidity to produce valid results. The aim of this study was to evaluate whether the combination of admin...

    Authors: Paul E Ronksley, Willis H Tsai, Hude Quan, Peter Faris and Brenda R Hemmelgarn
    Citation: BMC Medical Research Methodology 2009 9:50
  32. Linking population health data to pathology data is a new approach for the evaluation of predictive tests that is potentially more efficient, feasible and efficacious than current methods. Studies evaluating t...

    Authors: Samantha J Lain, Charles S Algert, Vitomir Tasevski, Jonathan M Morris and Christine L Roberts
    Citation: BMC Medical Research Methodology 2009 9:48
  33. Response rates in surveys have been falling over the last 20 years, leading to the need for novel approaches to enhance recruitment. This study describes strategies used to maximise recruitment to a home inter...

    Authors: Kirsty Kiezebrink, Iain K Crombie, Linda Irvine, Vivien Swanson, Kevin Power, Wendy L Wrieden and Peter W Slane
    Citation: BMC Medical Research Methodology 2009 9:46
  34. Self-reported data are a common source of information about drug exposure. Modes of data collection differ considerably and the questionnaire's structure may affect prevalence estimates. We compared the recall...

    Authors: Helena Gama, Sofia Correia and Nuno Lunet
    Citation: BMC Medical Research Methodology 2009 9:45
  35. Lower-than-expected incidence of HIV undermines sample size calculations and compromises the power of a HIV prevention trial. We evaluated the effectiveness of interim monitoring of HIV infection rates and on-...

    Authors: Vera Halpern, Orikomaba Obunge, Folasade Ogunsola, Sakiru Otusanya, John Umo-Otong, Chin-Hua Wang and Neha Mehta
    Citation: BMC Medical Research Methodology 2009 9:44
  36. The timing of prophylactic antibiotic administration is a patient safety outcome that is recurrently tracked and reported. The interpretation of these data has important implications for patient safety practic...

    Authors: Carrie Cartmill, Lorelei Lingard, Glenn Regehr, Sherry Espin, John Bohnen, Ross Baker and Lorne Rotstein
    Citation: BMC Medical Research Methodology 2009 9:43
  37. Studies of cancer incidence and early management will increasingly draw on routine electronic patient records. However, data may be incomplete or inaccurate. We developed a generalisable strategy for investiga...

    Authors: A Rosemary Tate, Alexander GR Martin, Tarita Murray-Thomas, Sarah R Anderson and Jackie A Cassell
    Citation: BMC Medical Research Methodology 2009 9:42
  38. Assumptions underlying placebo controlled trials include that the placebo effect impacts on all study arms equally, and that treatment effects are additional to the placebo effect. However, these assumptions h...

    Authors: M Diana van Die, Kerry M Bone, Henry G Burger and Helena J Teede
    Citation: BMC Medical Research Methodology 2009 9:41
  39. Recruitment and retention of patients and healthcare providers in randomised controlled trials (RCTs) is important in order to determine the effectiveness of interventions. However, failure to achieve recruitm...

    Authors: Claire S Leathem, Margaret E Cupples, Mary C Byrne, Mary O'Malley, Ailish Houlihan, Andrew W Murphy and Susan M Smith
    Citation: BMC Medical Research Methodology 2009 9:40
  40. In a multicenter trial, responses for subjects belonging to a common center are correlated. Such a clustering is usually assessed through the design effect, defined as a ratio of two variances. The aim of this...

    Authors: Emilie Vierron and Bruno Giraudeau
    Citation: BMC Medical Research Methodology 2009 9:39
  41. The gathering of feedback on doctors from patients after consultations is an important part of patient involvement and participation. This study first assesses the 23-item Patient Feedback Questionnaire (PFQ) ...

    Authors: Tsair-Wei Chien, Weng-Chung Wang, Sho-Be Lin, Ching-Yih Lin, How-Ran Guo and Shih-Bin Su
    Citation: BMC Medical Research Methodology 2009 9:38
  42. Cluster randomized trials (CRTs) are increasingly used to assess the effectiveness of interventions to improve health outcomes or prevent diseases. However, the efficiency and consistency of using different an...

    Authors: Jinhui Ma, Lehana Thabane, Janusz Kaczorowski, Larry Chambers, Lisa Dolovich, Tina Karwalajtys and Cheryl Levitt
    Citation: BMC Medical Research Methodology 2009 9:37
  43. In the last decade mobile telephone use has become more widespread among children. Concerns expressed about possible health risks have led to epidemiological studies investigating adverse health outcomes assoc...

    Authors: Imo Inyang, Geza Benke, Joseph Morrissey, Ray McKenzie and Michael Abramson
    Citation: BMC Medical Research Methodology 2009 9:36

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