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Women With Type 2 Diabetes Have Increased Risks Of Poor Cognitive Function & Substantial Cognitive Decline

Posted: Wednesday, March 10, 2004

To examine the association of type 2 diabetes with baseline cognitive function and cognitive decline over two years of follow up, focusing on women living in the community and on the effects of treatments for diabetes, Harvard researchers used the Nurses' health study in the United States. Two cognitive interviews were carried out by telephone during 1995-2003 among 18 999 women aged 70-81 years who had been registered nurses and completed the baseline interview; to date, 16 596 participants have completed follow up interviews after two years. Cognitive assessments included telephone interview of cognitive status, immediate and delayed recalls of the East Boston memory test, test of verbal fluency, delayed recall of 10 word list, and digit span backwards.

They found that after multivariate adjustment, women with type 2 diabetes performed worse on all cognitive tests than women without diabetes at baseline. For example, women with diabetes were at 25-35% increased odds of poor baseline score (defined as bottom 10% of the distribution) compared with women without diabetes on the telephone interview of cognitive status and the global composite score (odds ratios 1.34 and 1.26 respectively). Odds of poor cognition were particularly high for women who had had diabetes for a long time (1.52 and 1.49 respectively, for 15 years' duration or more). In contrast, women with diabetes who were on oral hypoglycemic agents performed similarly to women without diabetes (1.06 and 0.99), while women not using any medication had the greatest odds of poor performance (1.71 and 1.45) compared with women without diabetes. There was also a modest increase in odds of poor cognition among women using insulin treatment. All findings were similar when cognitive decline was examined over time.

The researchers concluded: "Women with type 2 diabetes had increased odds of poor cognitive function and substantial cognitive decline. Use of oral hypoglycemic therapy, however, may ameliorate risk."

Source: Diabetes In Control.com