Journal ArticleDOI
Sample size and optimal designs for reliability studies
TLDR
A functional approximation to earlier exact results is shown to have excellent agreement with the exact results and one can use it easily without intensive numerical computation.Abstract:
A method is developed to calculate the required number of subjects k in a reliability study, where reliability is measured using the intraclass correlation rho. The method is based on a functional approximation to earlier exact results. The approximation is shown to have excellent agreement with the exact results and one can use it easily without intensive numerical computation. Optimal design configurations are also discussed; for reliability values of about 40 per cent or higher, use of two or three observations per subject will minimize the total number of observations required.read more
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Journal ArticleDOI
Sample size requirements for training to a kappa agreement criterion on clinical dementia ratings.
TL;DR: It is found that testing raters on 5 or more patients per CDR level will yield the desired confidence in estimated κ, and if the test involves greater representation of CDR stages that are harder to evaluate, at least 42 ratings are needed.
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Intra-rater repeatability of gait parameters in healthy adults during self-paced treadmill-based virtual reality walking
TL;DR: The findings demonstrate the repeatability of the GRAIL system available in the laboratory, and can be used to assist researchers and clinicians to distinguish ‘real’ changes in gait performance over time.
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Reliability and validity of 6MWT for outpatients with schizophrenia: A preliminary study
Eluana Gomes,Tânia Bastos,Tânia Bastos,Michel Probst,José Carlos Ribeiro,Gustavo Silva,Rui Corredeira +6 more
TL;DR: 6MWT shows good reliability for individuals with schizophrenia and good validity for the small sample of male participants in this study, and height, body fat mass, smoking behavior and minutes of PA/week were significantly associated with the 6MWT.
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Validity and reliability of criterion based clinical audit to assess obstetrical quality of care in West Africa
TL;DR: A CBCA adapted to the West African context and assessed its reliability and validity has substantial inter-rater reliability and there is compelling evidence of its validity as the tool performs according to theory.
Journal ArticleDOI
Individual ovarian volumes obtained from 2-dimensional and 3-dimensional ultrasound lack precision.
TL;DR: The results suggest that measurement of transvaginal ovarian volumes using both 2D and 3D ultrasound is imprecise for individuals, and the imprecision is greater for lower ovarian volumes, which may be important in clinical practice.