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PubMed2003

Longitudinal study of fasting serum glucose concentrations in healthy elderly. The New Mexico Aging Process Study.

BACKGROUND: The American Diabetes Association s Expert Committee on the Diagnosis and Classification of Diabetes Mellitus has made the recommendation that all individuals over the age of 45 years should be screened for diabetes every 3 years. OBJECTIVE: This study was designed to determine the necessity for screening healthy elderly (> 65 years) this frequently using fasting serum glucose (FSG) determinations. DESIGN: This is a longitudinal study of initially healthy, upper middle class, community-based volunteers, mostly age 65 years and older at entry into the study. Participants were followed longitudinally with annual FSG concentrations and body mass indices (BMI) for periods up to 18 years (mean 12.4 years). RESULTS: Only 4 of 299 individuals with entry FSG < 126 mg/dl (mean + S.D. age at entry 71.6 + 4.8 years) and 6 or more annual visits have subsequently met the Expert Committee criteria for the diagnosis of diabetes (two consecutive FSGs > 126 mg/dl unless under treatment). When one examines the slopes of FSGs plotted over time (years) for each individual, more participants had a negative slope (220) than positive slope (79), i.e., their FSGs tended to decrease with age. None of the 68 individuals entered age > 75 years subsequently developed diabetes or a significantly positive slope. CONCLUSIONS: It does not appear necessary to screen non-obese elders (excluding minorities) age >65 years with a FSG < 100 mg/dl, or those age >75 years every 3 years as recommended.

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PubMed2001

A biethnic community survey of cognition in participants with type 2 diabetes, impaired glucose tolerance, and normal glucose tolerance: the New Mexico Elder Health Survey.

OBJECTIVE: To determine whether elderly individuals with type 2 diabetes or impaired glucose tolerance are at increased risk for cognitive impairment compared with individuals with normal glucose tolerance. RESEARCH DESIGN AND METHODS: Elderly Hispanic individuals (n = 414) and non-Hispanic white individuals (n = 469) aged > or =65 years, randomly selected from the Medicare rolls of Bernalillo County (Albuquerque), NM, were recruited for an interview/examination that included an evaluation of glucose tolerance. Information on nine tests of cognitive function and two measures of depression allowed comparisons between diabetic status and these functions. Comparisons also were made between glycosolated hemoglobin concentrations and these cognitive tests in the 188 participants with diabetes. RESULTS: None of the mean scores on the tests of cognitive function was significantly lower in the participants with diabetes compared with those participants with normal glucose tolerance after adjustments for ethnicity, sex, age, level of education, and presence of depression, with or without elimination of those with dementia (Mini-Mental State Exam <18). Interestingly, participants with impaired glucose tolerance tended to score higher than those with normal glucose tolerance. No significant associations were found between glycosolated hemoglobin concentrations and cognitive test scores in participants with diabetes. CONCLUSIONS: We could not show any increased risk for cognitive impairment in participants with diabetes compared with those with normal glucose tolerance after adjustments for ethnicity, sex, age, education, and presence of depression, before or after elimination of dementia in this random sample from a biethnic population of predominantly community-dwelling elders.

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