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Introduction. Statistical information regarding the prevalence of metabolic syndrome among a wide age range of workers is insufficient. Methods. A total of 4278 men between the ages of 20 and 59 years participated in the study. Metabolic syndrome was diagnosed according to the International Diabetes Federation (IDF) and the National Cholesterol Education Program (NCEP) III criteria. Results. Overall, the prevalences of metabolic syndrome according to the IDF and NCEPIII criteria were 13.6% and 14.8%, respectively. The prevalence of metabolic syndrome according to the IDF (NCEPIII) criteria among workers in their 20s, 30s, 40s, and 50s were 4.8% (6.1%), 9.9% (12.2%), 18.4% (21.6%) and 25.8% (34.0%), respectively. A plot of the prevalence of metabolic syndrome according to the NCEPIII criteria versus age had a steep gradient and increased sharply for men in their 50s. In contrast, a plot of the prevalence of metabolic syndrome according to the IDF criteria versus age increased in a linear manner. Conclusion. The prevalence of metabolic syndrome increased among workers according to age, but the increasing trend and the absolute prevalence of metabolic syndrome differed according to the two sets of diagnostic criteria used in this study. [ABSTRACT FROM AUTHOR]