Selection Bias
Research News and Information

Saturday, November 21, 2009

Incidence of and risk factors for cognitive impairment in an early Parkinson disease clinical trial cohort.

Nov 2009 OBJECTIVE: To investigate the incidence of and risk factors for cognitive impairment in a large, well-defined clinical trial cohort of patients with early Parkinson disease (PD). METHODS: The Mini-Mental State Examination (MMSE) was administered ... Read more...

Use of archived specimens in evaluation of prognostic and predictive biomarkers.

6 Oct 2009 The development of tumor biomarkers ready for clinical use is complex. We propose a refined system for biomarker study design, conduct, analysis, and evaluation that incorporates a hierarchal level of evidence scale for tumor marker studies, ... Read more...

Prospective comparison of quality of life before and after observation, radiation, or surgery for vestibular schwannomas.

29 Sep 2009 OBJECT: The best management strategy for small-to medium-sized vestibular schwannomas (VSs) remains controversial between observation, radiation, and microsurgical resection (surgery). The authors undertook a prospective observational cohort study ... Read more...

Latest indexed articles for 'Selection Bias'

These are the very latest articles for this heading:

• Incidence of and risk factors for cognitive impairment in an early Parkinson disease clinical trial cohort. Nov 2009
• Bias in identifying and recruiting participants in cluster randomised trials: what can be done? 7 Oct 2009
• Use of archived specimens in evaluation of prognostic and predictive biomarkers. 6 Oct 2009
• Prospective comparison of quality of life before and after observation, radiation, or surgery for vestibular schwannomas. 29 Sep 2009
• Maintenance treatment for patients with bipolar disorder. 29 Sep 2009
• Effect of rising chemotherapy costs on the cost savings of colorectal cancer screening. 22 Sep 2009
• The present efficacy of multiple sclerosis therapeutics: Is the new 66% just the old 33%? 20 Sep 2009
• Will a reduction in community prescribing of quinolones decrease the prevalence of quinolone resistance? 13 Sep 2009
• [Analysis of quality data based on national clinical databases] 12 Sep 2009
• Factors influencing the response to postal questionnaire surveys about respiratory symptoms. 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
• Predictors of nonresponse in a questionnaire-based outcome study of vocational rehabilitation patients. 30 Aug 2009
• Sampling bias explains association between human papillomavirus and circumcision. 30 Aug 2009
• Re: "Methods of covariate selection: directed acyclic graphs and the change-in-estimate procedure". 29 Aug 2009
• Evidence-based medicine must be ... 16 Aug 2009
• [Emergency department X-rays requested by physicians or nurses] 8 Aug 2009
• Same, better, or worse? Neurocognitive effects of radiotherapy for low-grade gliomas remain unknown. 5 Aug 2009
• A systematic review of caregiver burden following stroke. 30 Jul 2009
• Beyond randomized controlled trials in attempted suicide research. 30 Jul 2009
• Monitoring severe hypoglycaemic episodes: sample bias? 30 Jul 2009

See a longer list of these articles.

Technical information about 'Selection Bias'

Definition: The introduction of error due to systematic differences in the characteristics between those selected and those not selected for a given study. In sampling bias, error is the result of failure to ensure that all members of the reference population have a known chance of selection in the sample.

Descriptor UI: D015983

Alternative terms: Selection Bias; Selection Biases; Biases, Selection; Bias, Selection; Sampling Bias; Bias, Sampling; Sampling Biases; Biases, Sampling; Sampling Error; Error, Sampling; Errors, Sampling; Sampling Errors;

Tree Number: N05.715.350.150.775; N06.850.490.500.500;

History Note: 91(90); was see under BIAS (EPIDEMIOLOGY) 1990

Technical Notes: IM GEN only; coord NIM with disease /epidemiol (IM) or specific non-disease term /statist; no qualif; specify geog if pertinent