It differs from the ADCS-CGIC used in AD trials mainly in its shorter length and its The CGIC rating is made on a 7-point Likert-type scale where change from. Characteristics and performance of a modified version of the ADCS-CGIC CIBIC+ in Alzheimer Disease Assessment Scale-cognitive, Activities of Daily Living. A mandate of the ADCS is to develop optimal assessment instruments for use in Living (ADL), and the Clinical Global Impression of Change Scale (CGIC).

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Mild cognitive impairment, Alzheimer’s disease, dementia, global impression of change, rating scales, donepezil, vitamin E, clinical trials. Written informed consent was obtained from all participants and study partners. Alzheimer Disease and Associated DisordersVol.

See other articles in PMC that cite the published article. We used several different regression models to evaluate the effect of the covariates on the CGIC at the 6 and 12 months assessments. Downloads that will be available after satisfactory completion of the Request Form. The proportional odds model is very similar to the GEE model for binary data, with the difference being that a covariate effect leads to an increase in the likelihood of the patient being in any subsequent higher MCI-CGIC category.

Criteria used by drug regulatory authorities. Imputation is done using the last observation carried forward LOCF. A rationale for the use of severity scales in longer-term trials is that clinicians may not be able to assess this change because they may not remember or be able to recreate from notes or records the patient’s baseline state and medical records at baseline may not be sufficient.

The goals of this investigation were to assess the feasibility of the use of this modified ADCS-CGIC in MCI clinical trials by assessing whether or not the CGIC distinguished a medication effect, whether or not baseline demographic or clinical characteristics predicted change, and whether or not there was an association between MCI-CGIC change and change in other clinical measures, to assess external or concurrent validity.


The CGIC rating is made on a 7-point Likert-type scale where change from baseline is rated as marked improvement 1moderate improvement 2minimal improvement 3no change 4minimal worsening 5moderate worsening 6marked worsening 7.

Because primary prevention trials will require large samples and modest treatment effects are expected, the use of standard clinician-administered, clinic-based measures are unlikely to be feasible.

ADRC – CGIC page

The difference in magnitude of the Adcd-cgic between donepezil or vitamin E treatment compared to placebo was similar to other secondary clinical outcomes – both scalw and not – in a trial in which the medications did not show overall advantages compared to placebo. The CGIC is measured in ordinal categories and can be considered ordered from improved to no change to worse.

Alzheimer Disease and Associated Disorders. National Center for Biotechnology InformationU.


Although mean difference data was not provided, at six-months It is a severity scale that assesses the current state of a patient without reference to a prior state and does not rate change over wdcs-cgic. The mean donepezil-placebo difference in CGIC of ADCS prevention instrument project: Ferris, PhD, John C. The co-primary, which compliments a significant difference between drug and placebo on a psychometric test, helps to determine the clinical significance of psychometric test differences for regulatory purposes.

Sccale, Philip Insel, Christopher M. Mild cognitive impairment can be distinguished from Alzheimer disease and normal aging for clinical trials. Because very few change scores were at the extreme ratings of marked worsening, moderate worsening, marked improvement, or moderate improvement, we evaluated the rate of change of MCI-CGIC using two models. We assessed feasibility for adcs-cbic use by determining whether or not: Table 4 Treatment effect sizes at 6 and 12 months: Nevertheless, the lack of significant outcomes compared to placebo limits the ability to compare these effect sizes.


One advantage is that the logistic link function specification takes csale account the ceiling and floor effects of the dependent variable, the CGIC, while the linear models do not The effect size of the donepezil-placebo difference was similar to that of other outcomes at 12 months.

To determine if the change in MCI-CGIC over 12 months differed between patients randomized to donepezil, vitamin E, or placebo, a GEE model for ordinal data was fit to the data to account for the clustering due to the repeated observations within a patient.

Variables at screening or baseline that were associated with worse CGIC scores over 6 and 12 months included white race, greater years of education, worse depression, dementia severity rating, cognitive, and daily activities scores, and lower memory domain scores on a neuropsychological battery.

Moreover, the scientific questions that the two models answer are different. There are two major reasons for this: We decided to use the GEE model because the scientific interest in this study was the estimation and inference of the regression parameters and not of the variance-covariance structure of the longitudinal data. Author manuscript; available in PMC Jul 1. The authors of the six month trial suggest that the lack of treatment differences might be due to the impact of MCI primarily on a single domain memory within the CGIC.

ADCS Instruments – ADCS

Maze tracing was not used in the domain score calculations. Schmitt reports past clinical trial grant support from Pfizer. The Alzheimer’s Disease Cooperative Study.