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Showing results for "sample".

61. PowerPoint Presentation (ppt file)
    effectivehealthcare.ahrq.gov/sites/default/files/medical-test-reviews-risk-bias.ppt
    June 01, 2012 - Selection bias The selection process determines the composition of the study sample. … Partial verification bias Only a selected sample of patients who underwent the index test is verified … Domain 1: Patient Selection Was a consecutive or random sample of patients enrolled? … Did the whole sample or a random selection of the sample receive verification using a reference standard … For the question, “Did the whole sample or a random selection of the sample receive verification using

62. Ch 2-User-Guide-To-Ocer 130129 (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/ch_2-user-guide-to-ocer_130129.pdf
    January 01, 2011 - designs, along with other designs relevant to CER such as case-cohort designs (selecting a random sample … analysis (e.g., blood levels, biologic materials for genetic analyses) is collected for a random sample … (Note that the random sample may contain cases.) … new-user design are clearly outlined in the paper by Ray.36 Limitations include the reduction in sample

63. Interventions Targeting Sensory Challenges in Children With Autism Spectrum Disorders - An Update (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/related_files/asd-interventions-disposition.pdf
    May 26, 2017 - Peer Reviewer #7 Methods Almost all of the studies reviewed are noted to have "small" sample size, … Moreover, most studies noted as a limitation their small sample size. … We selected a minimum sample size of 10 for RCTs because we felt that the typically greater controls … for bias and rigor helped to mitigate limitations of a smaller sample size. … We scanned a random sample of non-English abstracts (n=150) and identified few eligible items.

64. C-Diff-Infections-Surveillance-140925 (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/related_files/c-diff-infections-surveillance-140925.pdf
    January 01, 2014 - (a) Do the differences in performance measures vary with sample characteristics? … (a) Do the differences in performance measures vary with sample characteristics? … The lower limit of detection of the stool real-time PCR was 30 CFU/ml of stool sample per reaction … (ID C. difficile prototype [IDCd]) for isolation of C. difficile compared using three different sample … (a) Do the differences in performance measures vary with sample characteristics?

65. Evidence-based Practice Center Systematic Review Protocol (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/pdf/adhd_research-protocol.pdf
    August 10, 2010 - Sample size There are no restrictions for study sample size. … Published Online: August 10, 2010 extraction, a calibration exercise will be conducted using a random sample … will include study characteristics (e.g., first author, country of research origin, study design, sample … history of treatment(s), age of first diagnosis, etc), study outcomes (both of benefit and of harm), sample … explore the impact of key methodological study limitations, in particular 1) percent of withdrawals, 2) sample

66. Methods Guide for Medical Test Reviews Chapter 12 (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/pdf/methods-guidance-tests-prognostic_methods.pdf
    July 01, 2012 - Did the sample represent patients that would be tested in clinical practice? 4. … Were the results externally validated using an independent sample or internally validated via boot strap … need to be noted.15 If the investigators fit a new prognostic test or prediction equation to the sample … data (test development sample) by using the data to define cutoff levels or model its relationships … Comparing the predictive values of diagnostic tests: sample size and analysis for paired study designs

67. Quantitative Synthesis: Chapter 1. Decision To Combine Trials (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/pdf/ehc-presentation-quantitative-synthesis-chapter-1.pdf
    July 01, 2019 - D & E: Consider these high risk of bias situations when pooling a small number of studies: ► Small sample … sizes: Results from small trials are less reliable even when risk of bias is low.6 − If sample sizes … heterogeneity9 ► Critiques of I2: Underestimates heterogeneity in random effects models; increases as sample

68. Cystic-Fibrosis-Hgh Surveillance (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/related_files/cystic-fibrosis-hgh_surveillance.pdf
    August 01, 2012 - In addition, the study was not published in a pivotal journal, and the sample size was not larger than … Evidence Table Article ID / Cohort/First Author/Year Participants (age, sex, condition)/ Sample … Article ID / Cohort/First Author/Year Participants (age, sex, condition)/ Sample size Inclusion … Article ID / Cohort/First Author/Year Participants (age, sex, condition)/ Sample size Inclusion … Article ID / Cohort/First Author/Year Participants (age, sex, condition)/ Sample size Inclusion

69. App-D-Opioid-Chronic-Pain-Surveillance-Report-3 (xls file)
    effectivehealthcare.ahrq.gov/sites/default/files/related_files/app-d-opioid-chronic-pain-surveillance-report-3.xlsx
    September 30, 2015 - controlled trials Author, Year Study Design Duration Setting Country Eligibility Criteria Interventions Sample … Oral methadone (30 to 60 mg daily) (9 assigned, 6 f/u) Overall sample: Mean age: 41 years Female sex: … B (unmatched sample) Mean age (SD): 55.6 (13.22) vs. 58.2 (12.82) years Female sex: 9.88% vs. 9.49% … ); 38,716 (matched sample) Visit counts for physical therapy, pain clinics, chiropractic care, primary … HR 1.19 (95% CI 1.06 to 1.35) Insurance Fair Salkar, 2021 Case-control, Medicare 5% National Sample

70. S158 (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/s158.pdf
    October 01, 2007 - Validation study: representative sample of Medicare beneficiaries. … infarction was essentially the same before and after control for these additional covariates in the stage 2 sample … calibration Yes Yes Yes Validation study can be used to adjust multiple associations Yes (if random sample … files.41 External Validation Study The Medicare Current Beneficiary Survey (MCBS) is conducted on a sample … Two-stage case-control studies: precision of parameter estimates and considerations in selecting sample

71. Engaging-Caregivers-Appendix-C (xls file)
    effectivehealthcare.ahrq.gov/sites/default/files/related_files/engaging-caregivers-appendix-c.xlsx
    May 29, 2025 - nonrandomized studies Author, Year (Study Design) Did the Study Attempt To Enroll All (or a Random Sample

72. Cer-276-Ocd-Appendix-G (xls file)
    effectivehealthcare.ahrq.gov/sites/default/files/related_files/cer-276-ocd-appendix-g.xlsx
    January 01, 2022 - 0.52 52 111 3 6 7 none NA 37431399 Lambe 2021 DWS TOCS TOCS max average one off 1 discovery sample … 0.88 128 38 3 161 330 none NA 37431399 Lambe 2021 DWS TOCS TOCS total score one off 1 validation sample … Key Question 1: Quality PMID first_author Year Extractor Was a Consecutive or Random Sample of Patients … : We should discuss studies that enroll at least one clinical sample, e.g. … Lambe, AND a control sample. -Dale Steele Did All Patients Receive the Same Reference Standard?

73. Slide 1
    effectivehealthcare.ahrq.gov/sites/default/files/study-design-considerations-chapter-2.pptx
    January 01, 2013 - followed for incidence of outcomes Additional information required for analysis collected for a random sample … for analysis (e.g., blood levels, biologic materials for genetic analyses) is collected for a random sample … of the cohort and for all cases (note that the random sample may contain cases).

74. Work Plan for Methods Research on (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/pdf/study-design-classification_research.pdf
    December 01, 2010 - A sample of 30 studies was used to test the tool. … Further, the sample of studies that we tested covered a wide range of topics. … Further, at least one study of each design was included in the sample pool. … The sample of studies that we tested covered a wide range of topics. … Sample size requirements for reliability studies. Stat Med 1987;6:441-448. 37.

75. Research White Paper - Assessing the Predictive Validity of Strength of Evidence Grades: A Meta-Epidemiological Study (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/pdf/grades-predictive-values_white-paper.pdf
    September 01, 2015 - In this sample, the EPC approach to GRADE could not reliably predict the likelihood that individual … our study was to determine the predictive validity of the EPC approach to GRADE based on a diverse sample … For example, in about 20 percent of our sample (presented in Table 1), confidence intervals cross both … Second, how representative our sample is remains unclear. … In addition, our sample was limited to RCTs, so findings are likely not generalizable to research based

76. Rapid-Reviews-End-User White-Paper (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/pdf/rapid-reviews-end-user_white-paper.pdf
    April 01, 2016 - Sample Rapid Products From an initial list of 11 recently completed (within the past 2 to 3 years) EPC … While based on a small sample, this project suggests that some discussion within the EPC program may … However, our small sample size means that results may not be representative of all end-users and we … Can you take a look at the sample of rapid review products we provided (see Table and attachments): … Evidence Inventory Sample Acetylsalicylic Acid for Venous Thromboembolism Prophylaxis: an Update

77. Effective Health Care (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/pdf/TND_0332_07-29-2010.pdf
    January 01, 2010 - Transcription-mediated amplification of PCA3 and PSA mRNA in urine sample b. … Do measures of AV vary by assay design, method of sample collection, etc.? 3.

78. Fibromyalgia Executive (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/related_files/fibromyalgia_executive.pdf
    January 01, 2015 - At baseline, MDD subgroup sample sizes were small in all RCTs, excluding the pooled IPD RCT analyses … Sample sizes were small. … Adverse Effects Reporting None of the 10 mixed-sample RCTs with subgroup outcomes separately reported … In general, sample selection criteria were restrictive, and the extent to which such select patient … Sample selection criteria were most restrictive for pharmaceutical studies that excluded adults with

79. Self-Measured Blood Pressure: Future Research Needs (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/pdf/measuring-blood-pressure-future_research.pdf
    August 01, 2012 - Sample Size for a Randomized Controlled Trial for a Composite CVD Outcome Appendixes ....... 13 … This would require smaller sample sizes than for trials with CVD outcomes as the effect sizes would … An additional approach to decrease the necessary sample size would be to exclude individuals with a … Resource Use, Size, and Duration An RCT, especially one with a long duration and large sample size, … Sample size for a randomized controlled trial for a composite CVD outcome Total sample size for an

80. Research White Paper: A Framework To Facilitate the Use of Systematic Reviews and Meta-analyses in the Design of Primary Research Studies (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/pdf/primary-research-design_research.pdf
    January 01, 2012 - Goudie, et al. assessed a sample of randomized controlled trials (RCTs) published in leading medical … Several publications have proposed methods which can be used to simulate sample size calculations and … Does the proposed study have adequate sample size and power? … Insufficient data: too few primary studies, or studies that are too small (sample size inadequate or … Evidence-based sample size calculations based upon updated meta-analysis.