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Unlike CTT, item response theory (IRT) provides estimates of measurement error for different levels of ability, without the need for separate studies, and can determine if different tests are equivalently difficult when investigating differential deficits between groups.
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Because Little's Law operates only with the averages, the changes in the distribution of the number of deficits between age groups cannot be seen just from it alone.
A future goal is to analyze spinal cord pathology of all mice at a point in disease when there is a clear difference in neurological deficits between treated groups, such as at 110 days of age.
When examining differential deficits between different groups IRT, unlike CCT, can offer estimates of measurement error for different levels of cognitive ability, without having to conduct separate studies, and can establish whether different items or measures are equally difficult.
Comparison of the neurological deficit scores between groups was performed by the Mann-Whitney test.
Between-group deficits in performance survived co-variation for IQ.
The between-group deficits in trabecular BMD could not be accounted for by adjustment to muscle cross-sectional area (CSA), indicating that the bone deficit in RA patients was greater than what would be expected as a result of their atrophied muscles.
There was no difference in short-term memory (Hopkins Verbal Learning Test) or gross mental-neurologic deficits between the 2 groups (all P >.1).
An ANOVA model was also used to compare neuropsychological tests and measures of depression, fatigue, pain, and perceived cognitive deficits between the three groups.
Test score deficits between these two groups were equal to 22% of the interval between students categorization at the "proficient" level in Reading and 42% of the interval in Mathematics [ 5].
Functional tests showed balanced thermoregulatory deficits between vehicle-treated WBH group and CD34+ cells-treated WBH mice.
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