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KMID : 0371020090420060386
Journal of Preventive Medicine and Public Health
2009 Volume.42 No. 6 p.386 ~ p.391
Korean Genome and Epidemiology Study The Association of Central Obesity with Type 2 Diabetes among Koreans according to the Serum Gamma-Glutamyltransferase Level: Korean Genome and Epidemiology Study
Shin Ji-Yeon

Hwang Jun-Hyun
Jeong Jin-Young
Kim Sung-Hi
Moon Jai-Dong
Kim Young-Wook
Kim Yang-Ho
Leem Jong-Han
Ju Young-Su
Hong Young-Seoub
Ha Eun-Hee
Lee Yong-Hwan
Lee Duk-Hee
Kim Dong-Hyun
Abstract
Objectives : This cross-sectional study was performed to examine if the serum gamma-glutamyltransferase (GGT) level that is within its normal range is associated with the risk of type 2 diabetes and if the association between the waist hip ratio (WHR) and type 2 diabetes is different depending on the serum GGT levels.

Methods : The study subjects were 23,436 persons aged 40 years or older and who participated in regular health check-ups at 11 hospitals (males: 5,821, females: 17,615). The gender-specific quintiles of the serum GGT and WHR were used to examine the associations with type 2 diabetes.

Results : The serum GGT levels within their normal range were positively associated with type 2 diabetes only in women. The adjusted odds ratios (ORs) were 1.0, 1.0, 1.4, 2.1, and 2.5 according to the quintiles of the serum GGT (ptrend<0.01). The WHR was more strongly associated with the prevalence of diabetes among the women with a highnormal serum GGT level as compared with those with a low-normal serum GGT level (p for interaction=0.02). For example, the adjusted ORs for women with a low normal serum GGT level were 1.0, 1.2, 1.5, 2.2, and 2.4 according to the quintiles of the WHR, while those figures were 1.0, 2.4, 3.6, 5.0, and 8.3 among the women with a high normal serum GGT level. However, in men, the serum GGT was very weakly associated with type 2 diabetes and the association between the WHR and type 2 diabetes was not different depending on the serum GGT level.

Conclusions : Serum GGT within its normal range was positively associated with type 2 diabetes, and central obesity was more strongly associated with the prevalence of type 2 diabetes when the serum GGT level was highnormal. However, these associations were observed only in women, which is different from the previous findings. The stronger relation between central obesity and type 2 diabetes among women with a high-normal serum GGT level can be useful for selecting a group that is at high risk for type 2 diabetes irregardless of whatever the underlying mechanism is.
KEYWORD
Blood glucose, Gamma-glutamyltransferase, Gender, Obesity, Type 2 diabetes mellitus
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