We used longitudinal Clinical Dementia Rating Scale Sum of Boxes data, retention rates, and the proportions of trial-eligible cognitively normal participants age 65 and older in the National Alzheimer's Coordinating Center Uniform Data Set to model trial sample sizes, the numbers needed to enroll to account for drop out, and the numbers needed to screen to successfully complete enrollment.
These models were used to estimate, and test the statistical significance of the within-group differences between time points and the between-group differences at each time point and the estimate of clinical effect and drop-out/non data retention rates used to provide a power calculation needed for the future substantive study.
The rankings, long criticized for being based on flawed data and a subjective formula, factored in each school's reputation and data on retention rates, college entrance test scores, financial resources, faculty resources and graduation rates.
While both reviews identified studies providing data on retention rates from primary studies and strategies used to promote retention, these were not evaluated quantitatively in either review.
Among the 55 499 patients at baseline with symptomatic disease, 39 675 were eligible for 3-year follow-up, and 32 247 had data available (81% retention rate).
The prediction results of the filtration technique demonstrate around 75% data reduction with approximately 90% retention rate (inverse of data loss).
Graduation, transfer rate, and retention rate data refer to full-time, first-time students pursuing bachelor's degrees.
These faculty taught freshman courses, were familiar with retention rate data for 2001 through 2005 (Tables 3 and 4), and wanted to broaden bio-math related career goals for undergraduates thorough earlier exposure and research experiences.
Recombinant HSA may offer a new perspective, because reported data indicate a high retention rate in circulating blood and lower vascular permeability than with the native HSA [ 81]; however, potential immunological alteration after the use of recombinant HSA in critically ill patients must be investigated.
Assumptions include a difference of 1 point in pain scores between groups at one month, standard deviation of each group of 2 based on data from previous studies, a retention rate of 87%, and a two sided α level of 0.05.
