Results

Total Results: 969 records

Showing results for "design sample size".

161. Covariate Selection for Observational Comparative Effectiveness Research
     effectivehealthcare.ahrq.gov/sites/default/files/considerations-for-statistical-chapter-10.pptx
     January 01, 2013 - options that can be considered, which depend on the study question and the particulars of the study design … Complete-case analysis for subjects with no missing data: Can reduce sample size, limiting efficiency … However, an initial limitation with this approach is that sample size is reduced, which affects efficiency … model that will be used for primary and secondary analytical objectives Should take into account the design

162. Multidisciplinary Rehabilitation Programs for Moderate to Severe Traumatic Brain Injury in Adults: Future Research Needs (pdf file)
     effectivehealthcare.ahrq.gov/sites/default/files/pdf/traumatic-brain-injury-rehabilitation-future_research.pdf
     January 01, 2013 - example, factors that affect the feasibility of conducting randomized controlled trials include the sample … size needed for the outcome, the size of the available pool of potential subjects, followup duration … Research Design Considerations We generated research design considerations for identified research needs … Similar to RCT Sample size will need to be larger than experimental designs given heterogeneity … Sample size will need to be larger than randomized designs given heterogeneity of population and

163. Depression-Treatment-Ssri Executive (pdf file)
     effectivehealthcare.ahrq.gov/sites/default/files/related_files/depression-treatment-ssri_executive.pdf
     April 01, 2012 - Inadequate sample size was a factor in many studies. … Adequate sample size was an issue in these studies. … Sample sizes in future research studies should be sufficient to establish important margins of difference … Extant studies are limited in type of agents utilized, sample sizes, and population characteristics … A second study, a pilot with small sample size evaluating dose escalation, showed no effect.

164. Ptsd-Adult-Treatment Executive (pdf file)
     effectivehealthcare.ahrq.gov/sites/default/files/related_files/ptsd-adult-treatment_executive.pdf
     April 01, 2013 - size, prospective cohort studies with a sample size of at least 500, and case-control studies with … a sample size of at least 500. … 77a # of records excluded: 2,521 # of full-text articles excluded, with reasons: 380 Wrong study design … For KQs 1 through 5, we included RCTs with no sample size limit; we did not allow for inclusion of observational … size of 500 or greater.

165. S158 (pdf file)
     effectivehealthcare.ahrq.gov/sites/default/files/s158.pdf
     October 01, 2007 - Research Design: Review types of validation studies that allow adjustment for unmeasured confounding … †Internal validation studies contain information on disease outcome of interest by design. … Logistic regression analysis and efficient design for two-stage studies. … Two-stage case-control studies: precision of parameter estimates and considerations in selecting sample … size.

166. Trauma-Interventions-Maltreatment-Child Executive (pdf file)
     effectivehealthcare.ahrq.gov/sites/default/files/related_files/trauma-interventions-maltreatment-child_executive.pdf
     April 01, 2013 - was largely attributable to most bodies of evidence consisting of only one trial, many with small sample … sizes. … Sample sizes are commonly very small. … Statistical Considerations: Even with concerns about limited sample sizes and attrition, few studies … sizes and extensive heterogeneity of design, definitions, and outcomes, among other considerations

167. Evidence-based Practice Center Systematic Review Protocol (pdf file)
     effectivehealthcare.ahrq.gov/sites/default/files/pdf/undescended-testicle_research-protocol.pdf
     September 02, 2011 - publication, study location (e.g., country, city, state) and time period, population description, sample … size, and study type (e.g., randomized controlled trial, prospective observational study, etc.). … use established concepts of the quantity of evidence (e.g., numbers of studies, aggregate ending- sample … sizes), the quality of evidence (from the quality ratings on individual articles), and the coherence … Therefore study questions, design and/or methodological approaches do not necessarily represent the

168. S44 (pdf file)
     effectivehealthcare.ahrq.gov/sites/default/files/s44.pdf
     October 01, 2007 - He suggested a randomized delay, and Chalmers agreed to speak in favor of that design. … We explain that randomization is good method of design, but it is not essential. … delays in the controls; just one of DD trials had to collect data by survey of patients Outcomes, sample … size and stopping rules, participant flow, recruitment, baseline data Researcher Grant proposals with … This aspect of policy design, how- ever, was not in our purview.

169. Mental Health and Occupational Stress in the Emergency Medical Service and 911 Workforce: A Systematic Review (pdf file)
     effectivehealthcare.ahrq.gov/sites/default/files/related_files/ems-911-workforce-mental-health-protocol-amendment.pdf
     January 22, 2024 - In terms of study design, we expect to include a variety of non-randomized study designs because very … We will not restrict by sample size or study quality. … Key Questions No sample size restriction For Key Question 1 for EMS populations, we will After … No sample size restriction will apply to studies of 911 populations. … Because KQ 1 is largely about epidemiology (incidence, prevalence, and severity), a sample size

170. Patient-Centered-Medical-Home Executive (pdf file)
     effectivehealthcare.ahrq.gov/sites/default/files/related_files/patient-centered-medical-home_executive.pdf
     July 01, 2012 - Study design 2. PCMH components 3. Settings (e.g., practice size, geographic location) 4. … Study design KQ 1, KQ 4: Patient or cluster RCT, nonrandomized clustered controlled trial, controlled … & Magnitude of Effecta,b,c] Number of Studies (Subjects) SOE Domain– Risk of Bias: Study Design … & Magnitude of Effecta,b,c] Number of Studies (Subjects) SOE Domain– Risk of Bias: Study Design … Building the Evidence Base for the Medical Home: What Sample and Sample Size Do Studies Need?

171. DEcIDE 32: The Incident User Design in Comparative Effectiveness Research (pdf file)
     effectivehealthcare.ahrq.gov/sites/default/files/pdf/incident-user-design_research.pdf
     May 01, 2012 - design. … We also reviewed methods papers on the incident user design. … Issues That Motivate the Incident User Design Investigators struggle to design non-randomized studies … The Incident User Design Complements Propensity Score Analyses The incident user design results in … incident user design results from the other design and analysis options that it allows, which may improve

172. Supplemental Project To Assess the Transparency of Reporting Requirements for Studies Evaluating the Effectiveness of Treatment Options for Symptoms of Diabetic Peripheral Neuropathy (pdf file)
     effectivehealthcare.ahrq.gov/sites/default/files/pdf/transparency-neuropathy_research.pdf
     March 01, 2018 - Comparison of the sample size, primary outcome, and withdrawals due to adverse events reported in the … Data extraction elements Trial design Design (parallel or crossover) Number of groups Trial start … Two reviewers compared the planned sample size, the primary outcome, and the analysis plan specified … • Comparison of prespecified statistical plan • Sample sizes, total. … Sample Size Followup Published literature only Karmakar, 201435 Not found NA NA NA 28 6 weeks

173. Future Research Needs for the Comparative Effectiveness of Breathing Exercises and/or Retraining Techniques in the Treatment of Asthma (pdf file)
     effectivehealthcare.ahrq.gov/sites/default/files/pdf/asthma-treatment-future_research.pdf
     September 01, 2012 - Studies with larger sample sizes, including multicenter trials; 3. … Additionally, it was noted that all study designs should account for the need for larger sample sizes … However, such trials would need large sample sizes in order to account for presumably small-to-modest … Studies with larger sample sizes, including multicenter trials; 3. … Additionally, it was noted that all study designs should account for the need for larger sample sizes

174. Work Plan for Methods Research on (pdf file)
     effectivehealthcare.ahrq.gov/sites/default/files/pdf/study-design-classification_research.pdf
     December 01, 2010 - Implications for Practice The appropriate classification of studies by design or by design features … Further, studies may use one particular design for some outcomes and a different design for other outcomes … The reliance on study design labels, and the inappropriate or inaccurate use of study design labels … Sample size and optimal study desings for reliability studies. Stat Med 1998;17:101-110. 36. … Sample size requirements for reliability studies. Stat Med 1987;6:441-448. 37.

175. Masks-Surveillance-2-Appendix-Table-A-2 (xls file)
     effectivehealthcare.ahrq.gov/sites/default/files/masks-surveillance-2-appendix-table-a-2.xlsx
     March 01, 2020 - Masks in the Community Virus Strain Author Publication Year Title Date Retrieved Source Link/URL Study Design … Study Dates Geographic Setting Setting Inclusion Criteria Sample Size Age (mean, years) Female (%) Definition

176. Masks-Appendix-Table-B-2-Surveillance-Report (xls file)
     effectivehealthcare.ahrq.gov/sites/default/files/Masks-appendix-table-b-2-surveillance-report.xlsx
     March 01, 2020 - Masks in the Community Virus Strain Author Publication Year Title Date Retrieved Source Link/URL Study Design … Study Dates Geographic Setting Setting Inclusion Criteria Sample Size Age (mean, years) Female (%) Definition

177. Obesity-Child Executive (pdf file)
     effectivehealthcare.ahrq.gov/sites/default/files/related_files/obesity-child_executive.pdf
     March 31, 2010 - We did not exclude studies based on study sample size (Table A). … One reason for the nonsignificant effect on weight outcomes might have been that the sample sizes were … There are many differences across studies in term of settings, design, sample size and characteristics … However, due to the limited sample size, we could not conduct further stratifications to explore the … Studies With High Statistical Power We need more studies with large sample sizes and adequate length

178. Single-arm studies in comparative effectiveness reviews (pdf file)
     effectivehealthcare.ahrq.gov/sites/default/files/pdf/single-group-studies_white-paper.pdf
     January 01, 2013 - authors planned to use single group studies, selection criteria for single group studies (minimum sample … size, followup duration, or ―other‖), whether the results of different single group studies were … However, this interpretation is limited by the small sample size. F Figure 2. … in the randomized two arm trial designs (though the two arm studies required a 2–4 fold increased sample … size). 24 A third simulation study compared optimal single group and randomized phase 2 designs

179. Disposition of Comments: CER 224, Treatment of Depression in Children and Adolescents: A Systematic Review (pdf file)
     effectivehealthcare.ahrq.gov/sites/default/files/related_files/cer-224-depression-children-comments.pdf
     April 10, 2020 - size. … and sample size" column). … I may have missed where sample sizes were characterized—so was surprised in Table 7 to learn that Ns … There is no distinction between sample sizes in the hundreds and those with 10 or so per group- all … It emphasizes the adequacy of the sample size to rule out spurious associations and results that are

180. Evidence Report on the (pdf file)
     effectivehealthcare.ahrq.gov/sites/default/files/pdf/labor-nitrous-oxide_research-protocol.pdf
     August 24, 2011 - publication, study location (e.g., country, city, state) and time period, population description, sample … size, and study type (e.g., randomized controlled trial, prospective observational study, etc). … use established concepts of the quantity of evidence (e.g., numbers of studies, aggregate ending sample … sizes), the quality of evidence (from the quality ratings on individual articles), and the coherence … Therefore study questions, design and/or methodological approaches do not necessarily represent the