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Journal of Clinical Epidemiology

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https://www.readbyqxmd.com/read/28108353/rasch-analysis-supported-the-construct-validity-of-self-report-measures-of-activity-and-participation-derived-from-patient-ratings-of-the-icf-low-back-pain-core-set
#1
Karl S Bagraith, Jenny Strong, Pamela J Meredith, Steven M McPhail
OBJECTIVE: To investigate whether measures of activity limitations and participation restrictions with sound internal construct validity could be derived from patient ratings of the International Classification of Functioning, Disability and Health Low Back Pain Core Set (LBP-CS). STUDY DESIGN AND SETTING: The LBP-CS Self-Report Checklist (LBP-CS-SRC) was developed to permit patients to self-rate their functioning according to an extended set of activity and participation categories from the LBP-CS...
January 17, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28108352/commentary-on-epc-methods-an-exploration-of-the-use-of-text-mining-software-in-systematic-reviews
#2
Robin Paynter, Lionel L Bañez, Eileen Erinoff, Jennifer Matsuura, Shannon Potter
No abstract text is available yet for this article.
January 17, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28108351/response-to-letter-to-the-editor-by-a-huitfeldt-re-odds-ratios-deconstructed-a-new-way-to-understand-and-explain-odds-ratios-as-conditional-risk-ratios
#3
Fred M Hoppe, Daniel J Hoppe, Stephen D Walter
No abstract text is available yet for this article.
January 17, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28104463/moving-from-outcomes-to-values-to-deliver-high-quality-health-care
#4
Logan Trenaman, Nick Bansback
No abstract text is available yet for this article.
January 16, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28104462/questionnaires-used-to-assess-barriers-of-clinical-guideline-use-among-physicians-are-not-comprehensive-reliable-or-valid-a-scoping-review
#5
REVIEW
Melina L Willson, Robin Wm Vernooij, Anna R Gagliardi
OBJECTIVE: This study described the number and characteristics of questionnaires used to assess barriers of guideline use among physicians. STUDY DESIGN: A scoping review was conducted. MEDLINE and EMBASE were searched from 2005 to June 2016. English language studies that administered a questionnaire to assess barriers of guideline use among practicing physicians were eligible. Summary statistics were used to report study and questionnaire characteristics. Questionnaire content was assessed with a checklist of 57 known barriers...
January 16, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28093264/consort-guidelines-for-non-inferiority-trials-going-beyond-the-absolute-risk-difference
#6
Walter Palmas
No abstract text is available yet for this article.
January 13, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28093263/-cross-sectional-stepped-wedge-designs-always-reduce-the-required-sample-size-when-there-is-no-time-effect
#7
Xin Zhou, Xiaomei Liao, Donna Spiegelman
No abstract text is available yet for this article.
January 13, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28093262/the-anchor-based-minimal-important-change-mic-based-on-roc-analysis-or-predictive-modeling-may-need-to-be-adjusted-for-the-proportion-of-improved-patients
#8
Berend Terluin, Iris Eekhout, Caroline B Terwee
OBJECTIVES: Patients have their individual minimal important changes (iMICs) as their personal benchmarks to determine whether a perceived health-related quality of life (HRQOL) change constitutes a (minimally) important change for them. We denote the mean iMIC in a group of patients as the "genuine MIC" (gMIC). The aims of this paper are (1) to examine the relationship between the gMIC and the anchor-based minimal important change (MIC), determined by receiver operating characteristics (ROC) analysis or by predictive modeling; (2) to examine the impact of the proportion of improved patients on these MICs; and (3) to explore the possibility to adjust the MIC for the influence of the proportion of improved patients...
January 13, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28088596/indirect-evidence-of-reporting-biases-was-found-in-a-survey-of-medical-research-studies
#9
Loai N Albarqouni, José A López-López, Julian Pt Higgins
OBJECTIVE: To explore indirect evidence of reporting biases by examining the distribution of P-values reported in published medical articles, and to compare P-values distributions across different contexts. METHODS: We selected a random sample (N=1500) of articles published in PubMed in March 2014. We extracted information on study type, design, medical discipline and P-values for the first reported outcome and primary outcome (if specified) from each article. We plotted the P-values transformed to the z-score scale and used caliper tests to investigate threshold effects...
January 11, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28088595/clinical-trial-registration-was-not-an-indicator-for-low-risk-of-bias
#10
Cynthia M Farquhar, Marian G Showell, Emily A E Showell, Penny Beetham, Nora Baak, Selma Mourad, Vanessa M B Jordan
BACKGROUND: It has been proposed that systematic review authors should only include registered clinical trials in an effort to improve the overall quality of the evidence summarized. PURPOSE: To determine the prevalence of registered trials and to evaluate the risk of bias between registered and unregistered clinical trials. DATA SOURCES: The Cochrane Gynaecology and Fertility Group's specialized register was searched on 5(th) November 2015 for randomized controlled trials (RCTs) published from 2010-2014...
January 11, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28088594/the-number-of-primary-events-per-variable-affects-estimation-of-the-subdistribution-hazard-competing-risks-model
#11
Peter C Austin, Arthur Allignol, Jason P Fine
OBJECTIVE: To examine the effect of the number of events per variable (EPV) on the accuracy of estimated regression coefficients, standard errors, empirical coverage rates of estimated confidence intervals and empirical estimates of statistical power when using the Fine-Gray subdistribution hazard regression model to assess the effect of covariates on the incidence of events that occur over time in the presence of competing risks. STUDY DESIGN AND SETTING: Monte Carlo simulations were used...
January 11, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28088593/additional-considerations-are-required-when-preparing-a-protocol-for-a-systematic-review-with-multiple-interventions
#12
Anna Chaimani, Deborah M Caldwell, Tianjing Li, Julian Pt Higgins, Georgia Salanti
OBJECTIVES: The number of systematic reviews that aim to compare multiple interventions using network meta-analysis is increasing. In this paper, we highlight aspects of a standard systematic review protocol that may need modification when multiple interventions are to be compared. STUDY DESIGN AND SETTING: We take the protocol format suggested by Cochrane for a standard systematic review as our reference, and compare the considerations for a pairwise review with those required for a valid comparison of multiple interventions...
January 11, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28088592/a-systematic-review-found-that-deviations-from-intention-to-treat-are-common-in-randomized-trials-and-systematic-reviews
#13
Iosief Abraha, Francesco Cozzolino, Massimiliano Orso, Mauro Marchesi, Antonella Germani, Guido Lombardo, Paolo Eusebi, Rita De Florio, Maria Laura Luchetta, Alfonso Iorio, Alessandro Montedori
OBJECTIVES: To describe the characteristics, and estimate the incidence, of trials included in systematic reviews deviating from the intention-to-treat (ITT) principle. STUDY DESIGN AND SETTING: A 5% random sample of reviews (Medline 2006 to 2010). Trials from reviews were classified based on the intention-to-treat: 1) ITT trials (trials reporting standard ITT analyses); 2) mITT trials (modified ITT; trials deviating from standard ITT); or 3) no ITT trials. RESULTS: Of 222 reviews, 81 (36%) included at least one mITT trial...
January 11, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28088591/specific-agreement-on-dichotomous-outcomes-in-the-situation-of-more-than-two-raters
#14
Henrica C W de Vet, Rieky E Dikmans, Iris Eekhout
OBJECTIVE: For assessing inter-rater agreement the concepts of observed agreement and specific agreement have been proposed. The situation of two raters and dichotomous outcomes has been described, whereas often times multiple raters are involved. We aim to extend it for more than two raters and examine how to calculate agreement estimates and 95% confidence intervals (CIs). STUDY DESIGN AND SETTING: As an illustration we used a reliability study that includes the scores of 4 plastic surgeons classifying photographs of breasts of 50 women, after breast reconstruction into 'satisfied' or 'not satisfied'...
January 11, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28063917/subjecting-known-facts-to-flawed-empirical-testing
#15
LETTER
Vance W Berger
No abstract text is available yet for this article.
January 4, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28063916/response-to-the-letter-by-guogen-shan-and-hua-zhang-response-to-letter-commenting-j-clin-epidemiol-2015-68-733-739
#16
LETTER
Cornelia M Borkhoff, Patrick R Johnston, Derek Stephens, Eschetu Atenafu
No abstract text is available yet for this article.
January 4, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28063915/univariate-and-bivariate-likelihood-based-meta-analysis-methods-performed-comparably-when-marginal-sensitivity-and-specificity-were-the-targets-of-inference
#17
Issa J Dahabreh, Thomas A Trikalinos, Joseph Lau, Christopher H Schmid
OBJECTIVE: To compare statistical methods for meta-analysis of sensitivity and specificity of medical tests (e.g., diagnostic or screening tests). STUDY DESIGN AND SETTING: We constructed a database of PubMed-indexed meta-analyses of test performance from which 2×2 tables for each included study could be extracted. We re-analyzed the data using univariate and bivariate random effects models fit with inverse variance and maximum likelihood methods. Analyses were performed using both normal and binomial likelihoods to describe within-study variability...
January 4, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28063914/sham-surgical-procedures-for-pain-intervention-result-in-significant-improvements-in-pain-systematic-review-and-meta-analysis
#18
Alice P Gu, Chris N Gu, Ahmed T Ahmed, Mohammad H Murad, Zhen Wang, David F Kallmes, Waleed Brinjikji
OBJECTIVE: To perform a systematic review and meta-analysis to study the magnitude of the placebo effect associated with sham surgery procedures. STUDY DESIGN: We conducted a systematic search for randomized controlled clinical trials comparing any type of surgery to a corresponding sham placebo group and compared improvements in the sham treatment arms in subjective, objective, categorical and continuous outcomes, as well as complication rates and mortality. Effect sizes were reported as standardized mean differences (SMD)...
January 4, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28063913/systematic-survey-of-randomized-trials-evaluating-the-impact-of-alternative-diagnostic-strategies-on-patient-important-outcomes
#19
Regina El Dib, Kari A O Tikkinen, Elie A Akl, Huda A Goma, Reem A Mustafa, Arnav Agarwal, Christopher R Carpenter, Yuchen Zhang, Eliane C Jorge, Ricardo A M B Almeida, Paulo do Nascimento Junior, Joao Vitor P Doles, Ahmad A Mustafa, Behnam Sadeghirad, Luciane C Lopes, Cristiane C Bergamaschi, Erica A Suzumura, Marília M A Cardoso, Marluci Betini, José Eduardo Corrente, Samuel B Stone, Holger J Schunemann, Gordon H Guyatt
OBJECTIVE: To provide a perspective on the current practice of randomized controlled trials (RCTs) of diagnostic strategies focusing on patient-important outcomes. STUDY DESIGN AND SETTING: We conducted a comprehensive search of Medline and included RCTs published in full-text reports that evaluated alternative diagnostic strategies. RESULTS: Of 56,912 unique citations we sampled 7,500 and included 103 eligible RCTs, therefore suggesting that Medline includes approximately 781 diagnostic RCTs...
January 4, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28063912/exact-unconditional-sample-size-determination-for-paired-binary-data-letter-commenting-j-clin-epidemiol-2015-68-733-739
#20
LETTER
Guogen Shan, Hua Zhang
No abstract text is available yet for this article.
January 4, 2017: Journal of Clinical Epidemiology
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