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The association between insulin resistance and Framingham risk score among type 2 diabetes.
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Hee Sook Park, Ji Eun Yun, Soo Jin Yoon, Eurin Cho, Kyung A Ahn, Seok Won Park, Chul Woo Ahn, Dae Jung Kim, Young Duk Song, Young Ju Choi, Mi Ae Cho, Eun Jig Lee, Kap Bum Huh, Sun Ha Jee
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Korean J Epidemiol. 2007;29(1):46-58.
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Abstract
BACKGROUND
AND PURPOSE: Insulin resistance has been known to be associated with the risk of cardiovascular diseases.
However, the relationship with Framingham risk score among type 2 diabetes has not been well known. We investigated the relationship between insulin resistance (IR) and the Framingham risk score(FRS) among type 2 diabetes in Korea.METHODS We estimated the 5-year risk of ischemic heart disease(IHD) based on Framingham equation among 1,941 diabetes patients(1,294 men and 647 women), who visited Huh's clinic, enrolled from January 2003 to June 2006. IR, which was measured by insulin tolerance test (ITT), was divided into five groups(Q1 to Q5). High risk of IHD was defined as upper 10 percentile of FRS. Multivariate regression and logistic regression models were used to see independent association of higher quintiles of IR level, compared with lowest quintile(Q1) for the risk of IHD.RESULTS Mean (+/-standard deviation) 5-year FRS of study subjects were 8.40%(+/-6.89) for men and 5.92%(+/-5.23) for women. There were significant correlation between IR, body mass index, HbA1C, fasting glucose, triglyceride, LDL-cholesterol, C-peptide and FRS in both men and women.
After adjusting for triglyceride, LDL-cholesterol, C-peptide, multivariate regression model analysis showed that IR was independently associated with the FRS. A positive association between IR and high risk of IHD was observed in men: highest versus lowest quintile of IR (odds ratio 5.45 in men and 4.71 in women).CONCLUSION Increased IR level was independently associated with risk of IHD measured by FRS among type 2 diabetes in Korea.
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Framingham Equation Model Overestimates Risk of Ischemic Heart Disease in Korean Men and Women.
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Kyung A Ahn, Ji Eun Yun, Eo Rin Cho, Chung Mo Nam, Yangsu Jang, Sun Ha Jee
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Korean J Epidemiol. 2006;28(2):162-170.
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Abstract
BACKGROUND
The prediction of the absolute risk of ischemic heart disease (IHD) is commonly based on the risk prediction equations, originated from the Framingham Heart Study.METHOD Framingham equation model was applied to participants from 2001 Korean National Health and Nutrition Examination Survey (KNHNES) to estimate the 5 year risk of IHD among Koreans ranging from 30 to 74 year-olds. The estimated risks were compared to the incidence and admission rates from two statistical reports among Koreans. Five year admission rate was estimated by the annual report from National Health Insurance Corporation (NHIC).RESULTS The average ages (standard deviation) were 34.31(27.23) year-old for KNHNES and 48.26(12.87) year-old for Framingham population used in this study. The risk of IHD predicted by the Framingham equation model substantially exceeded the risks actually reported in Korea. Five-year predicted risks by Framingham equation model were 4.86% for men and 1.93% for women; whereas from incidence data in Korea, five-year risks for acute myocardial infarction (AMI) were for 0.47% for men and 0.18% for women. These AMI incidence was similar to the admission rate (0.34 for men and 0.15 for women) estimated by NHIC. Also, 5-year admission rate of IHD were 1.16 for men and 0.78 for women.
The magnitude of risk overestimation by Framingham mode is approximately at least 150 to 320%.CONCLUSION Korean guidelines for the management for high risk group of IHD need to develop and correct for overestimation to avoid inflation of costs in primary prevention.
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