Archival data were reviewed from 4248 consecutive participants recruited into the Mayo Clinic Alzheimer's Disease Research Center (ADRC) and Alzheimer's Disease Patient Registry (ADPR) database. The Rochester Mayo ADPR is responsible for recruiting dementia patients and non-demented control subjects for studies on the progression of Alzheimer's disease through the Department of Community and Internal Medicine and does not operate in Jacksonville. The Rochester and Jacksonville ADRC sites acquire dementia patients from Behavioral Neurology. The Jacksonville ADRC site also recruits community controls via churches and community agencies. The same inclusion/exclusion criteria are applied for normal controls across both recruitment sites and has been published extensively through analyses of the MOANS16 (link)-19 and MOAANS20 (link)-22 (link) data. Patients with memory concerns raised by either the patient themselves, a family member, or a physician undergo a comprehensive neurological evaluation and neuropsychological testing to confirm or rule out dementia and Alzheimer disease.
A total of 1141 individuals with 16 or more self-reported years of education were identified. The sample included 1064 (93%) individuals who self-identified as Caucasian and 77 (7%) who self-identified as African-American. Of the 1141 participants, 658 individuals (242 males and 416 females) had no dementia and were considered cognitively normal (see Ivnik et al.19 for full criteria used to define normal cognition). The remaining 307 (164 males and 143 females) carried diagnoses of dementia established via consensus among ADRC investigators and based on published diagnostic criteria. Diagnoses included 202 (66%) patients with probable Alzheimer's disease, 48 (16%) with dementia with Lewy bodies, 18 (6%) with frontotemporal dementia, 13 (4%) with vascular dementia, and 25 (8%) with other dementia etiologies. A sample of 176 patients (106 males and 70 females) diagnosed with Mild Cognitive Impairment (MCI) was also included for comparison purposes.
The total sample included 512 (45%) males and 629 (55%) females, with a mean age of 75.9 (SD=7.2) years and a mean self-reported education of 17.1 (SD=1.5) years. There were no significant between-group differences (dementia vs. no dementia) in terms of age, gender, or education.
While the MMSE was available in diagnostic meetings, the diagnosis of dementia (and particular subtype) was arrived at via consensus-based judgment taking into account information from the neurological examination, clinical interview, lab results, imaging, informant ratings of activities of daily living (ADLs), as well as neuropsychological test data. Therefore, the MMSE had minimal impact on diagnostic decisions in the dementia cohort and was not considered at all as part of the determination of control status.
A total of 1141 individuals with 16 or more self-reported years of education were identified. The sample included 1064 (93%) individuals who self-identified as Caucasian and 77 (7%) who self-identified as African-American. Of the 1141 participants, 658 individuals (242 males and 416 females) had no dementia and were considered cognitively normal (see Ivnik et al.19 for full criteria used to define normal cognition). The remaining 307 (164 males and 143 females) carried diagnoses of dementia established via consensus among ADRC investigators and based on published diagnostic criteria. Diagnoses included 202 (66%) patients with probable Alzheimer's disease, 48 (16%) with dementia with Lewy bodies, 18 (6%) with frontotemporal dementia, 13 (4%) with vascular dementia, and 25 (8%) with other dementia etiologies. A sample of 176 patients (106 males and 70 females) diagnosed with Mild Cognitive Impairment (MCI) was also included for comparison purposes.
The total sample included 512 (45%) males and 629 (55%) females, with a mean age of 75.9 (SD=7.2) years and a mean self-reported education of 17.1 (SD=1.5) years. There were no significant between-group differences (dementia vs. no dementia) in terms of age, gender, or education.
While the MMSE was available in diagnostic meetings, the diagnosis of dementia (and particular subtype) was arrived at via consensus-based judgment taking into account information from the neurological examination, clinical interview, lab results, imaging, informant ratings of activities of daily living (ADLs), as well as neuropsychological test data. Therefore, the MMSE had minimal impact on diagnostic decisions in the dementia cohort and was not considered at all as part of the determination of control status.