Sample Size
Research News and Information

Saturday, November 21, 2009

A genome-wide linkage and association scan reveals novel loci for autism.

6 Oct 2009 Although autism is a highly heritable neurodevelopmental disorder, attempts to identify specific susceptibility genes have thus far met with limited success. Genome-wide association studies using half a million or more markers, particularly those ... Read more...

Baseline characteristics and statistical power in randomized controlled trials: selection, prognostic targeting, or covariate adjustment?

29 Sep 2009 OBJECTIVE: Heterogeneity of patients is a common problem in randomized controlled trials (RCTs) in various fields of clinical research. We aimed to investigate the potential benefits of different approaches for dealing with heterogeneity in a case ... Read more...

Outcome measures to assess efficacy of treatments for age-related macular degeneration.

29 Sep 2009 In a clinical trial of age-related macular degeneration (AMD), the outcome measure chosen to assess the efficacy of treatment should reflect the purpose of the trial and the stage of development of the treatment. This article considers 3 classes of ... Read more...

Latest indexed articles for 'Sample Size'

These are the very latest articles for this heading:

• Aprepitant for the prevention of chemotherapy-induced nausea and vomiting in adolescents. 13 Dec 2009
• Angiotensin-converting enzyme inhibitor therapy at the time of coronary artery bypass surgery: when a friend turns mean-spirited. Nov 2009
• Antimicrobial prophylaxis for urinary tract infection in children. 27 Oct 2009
• A genome-wide linkage and association scan reveals novel loci for autism. 6 Oct 2009
• The tyranny of power: is there a better way to calculate sample size? 4 Oct 2009
• Baseline characteristics and statistical power in randomized controlled trials: selection, prognostic targeting, or covariate adjustment? 29 Sep 2009
• Increasing power in randomized controlled trials. 29 Sep 2009
• Outcome measures to assess efficacy of treatments for age-related macular degeneration. 29 Sep 2009
• Contrast-induced nephropathy: we need all the data to discern the truth. 29 Sep 2009
• Autoimmune disease and risk for Parkinson disease: a population-based case-control study. 21 Sep 2009
• The HAART cell phone adherence trial (WelTel Kenya1): a randomized controlled trial protocol. 20 Sep 2009
• Relative power and sample size analysis on gene expression profiling data. 15 Sep 2009
• Power and sample size for nested analysis of molecular variance. 13 Sep 2009
• The effects of excluding patients from the analysis in randomised controlled trials: meta-epidemiological study. 5 Sep 2009
• [Effectiveness of D,L-sotalol in post-ablative atrial arrhythmias in patients with atrial fibrillation treated with radiofrequency ablation] 4 Sep 2009
• Design, statistical analysis and sample size calculation of a phase IIb/III study of linagliptin versus voglibose and placebo. 3 Sep 2009
• Nanocapillaries for open tubular chromatographic separations of proteins in femtoliter to picoliter samples. 30 Aug 2009
• Diagnostic test validation: cochlear hydrops analysis masking procedure in Ménière's disease. 30 Aug 2009
• The use of Geographic Information System (GIS) and non-GIS methods to assess the external validity of samples postcollection. 30 Aug 2009
• Risk factors: The obesity paradox-an artifact of small sample size? 30 Aug 2009

See a longer list of these articles.

Technical information about 'Sample Size'

Definition: The number of units (persons, animals, patients, specified circumstances, etc.) in a population to be studied. The sample size should be big enough to have a high likelihood of detecting a true difference between two groups. (From Wassertheil-Smoller, Biostatistics and Epidemiology, 1990, p95)

Descriptor UI: D018401

Alternative terms: Sample Size; Sample Sizes; Size, Sample; Sizes, Sample;

Tree Number: E05.318.780.762; E05.581.500.902; N05.715.360.780.692; N06.850.520.445.762;

History Note: 95

Technical Notes: NIM with specific population or circumstances sampled (IM); no qualif; not restricted to epidemiology