Given the variability in study design, methods, patient populations, and outcome variables tested, the conclusions drawn from the combination of these three studies should be carefully weighed.
This may be due, in part, to variability in study design and sampling methodology across studies.
In order to assess the variability in study parameters without dietary intervention, 13 of the 27 patients were also studied 16 weeks prior to the start of the VLCD.
The review also identified enormous variability in study design and statistical rigor, which appear to mask the expected patterns.
To aid laboratories in designing useful DNT studies for regulatory consideration, an operational framework for evaluating observed variability in study data has been developed.
Variability in study results may partially be explained by small sample sizes resulting in limited statistical power, clinical heterogeneity between patient samples, and methodological differences between studies.
This heterogeneity in study findings largely resulted from variability in study design, gender, and the method used to measure sleep duration.
Understanding tanning motivations, perceptions, barriers, and demographic characteristics of this population is critical to modifying these behaviors, but is limited by variability in study design, sample size, and outcomes measured in the current literature.
Although there is considerable variability in study design and duration, study population, type of soy isoflavone employed in the intervention, and study outcomes, the evidence points to a lack of a protective role of soy isoflavones in the prevention of postmenopausal bone loss.
Despite the variability in study design, longitudinal studies report that the risk of dementia, cognitive impairment, cognitive decline, and Alzheimer's disease is lower among persons engaging in high levels of physical activity, relative to those engaging in low levels of physical activity.
However, given the wide variability in study design and treatment duration across studies, these findings should be interpreted cautiously.
