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Trends in the Epidemiology of Patients with Diabetes in Japan

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Trends in the Epidemiology of Patients with Diabetes in Japan Research and Reviews Trends in the Epidemiology of Patients with Diabetes in Japan JMAJ 53(1): 36–40, 2010 Aya MORIMOTO,*1 Rimei NISHIMURA,*2 Naoko TAJIMA*3 Abstract A comparison of the results of the National Diabetes Survey between 1997 and 2007 in Japan showed that the percentage of “people strongly suspected of having diabetes” (diabetes) increased from 9.9% to 15.3% in males and from 7.1% to 7.3% in females, and the percentage of “people for whom the possibility of diabetes cannot be precluded” (prediabetes) increased from 8.0% to 14.0% in males and from 7.9% to 15.9% in females. The increase in the percentage of “people for whom the possibility of diabetes cannot be precluded” was remarkably large. In absolute numbers, “people strongly suspected of having diabetes” increased from approximately 6.9 million to 8.9 million and “people for whom the possibility of diabetes cannot be precluded” increased from approximately 6.8 million to 13.2 million during the same period. The incidence rate of type 2 diabetes in children (per 100,000 person-years) was higher among junior high school students (6.73) than among elementary school students (0.75), and 80% of diabetic children were obese. Sixty percent of diabetic children had diabetic relative(s) within the relation of first or second degree. The incidence rate of type 1 diabetes in children, ranging from approximately 1.5 to 2.5 (per 100,000 person- years), was low in international comparison. Key words Diabetes, Prevalence rate, Incidence rate Type 2 Diabetes in Adults examine fasting plasma glucose levels. Although these surveys did not use the criteria of the Japan National Diabetes Surveys Diabetes Society for the diagnosis of diabetes, they In Japan, the National Diabetes Surveys in 1997 are useful for tracking the trends in the percentage and 2002 and the National Health and Nutrition and number of screening-positive individuals. Survey in 2007 reported the number and per- The comparison of the percentage of screening- centage of “people strongly suspected of having positive individuals between 1997 and 2007 diabetes” (diabetes) defined by HbA1cՆ6.1% or showed that the percentage of “people strongly a self-report of being on pharmacotherapy for suspected of having diabetes” increased from diabetes and those of “people for whom the pos- 9.9% to 15.3% in males and from 7.1% to 7.3% in sibility of diabetes cannot be precluded” (predia- females, and the percentage of “people for whom betes) defined by 5.6%ՅHbA1cϽ6.1% among the possibility of diabetes cannot be precluded” people aged 20 years or more. These surveys, increased from 8.0% to 14.0% in males and from solely depending on the two parameters of 7.9% to 15.9% in females.1,2 The increase in the HbA1c and the history of diabetes, did not per- percentage of “people for whom the possibility of form 75 g oral glucose tolerance tests (OGTT) or diabetes cannot be precluded” was remarkably *1 Assistant Professor, Division of Diabetes, Metabolism and Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan ([email protected]). *2 Lecturer, Division of Diabetes, Metabolism and Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan. *3 Professor, Division of Diabetes, Metabolism and Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan. This article is a revised English version of a paper originally published in the Journal of the Japan Medical Association (Vol.138, No.1, 2009, pages 19–22). 36 JMAJ, January/February 2010 — Vol. 53, No. 1 TRENDS IN THE EPIDEMIOLOGY OF PATIENTS WITH DIABETES IN JAPAN large. The breakdown by sex and age group strongly suspected of having diabetes” and “peo- shows that the percentage of screening-positive ple for whom the possibility of diabetes cannot individuals increases in elderly people (Fig. 1). be precluded”) may be regarded as a rough Reflecting the increases of elderly people in estimate of the number of people suspected of the Japanese general population, the estimated having type 2 diabetes. Due to the recent increase total number of those based on the population in obese people in a super-aging society, Japan is data has also been increasing year by year (Fig. 2). inevitably going to see a further increase in the In a comparison between 1997 and 2007, the number of people with diabetes, particularly in number of “people strongly suspected of having elderly people. diabetes” increased from approximately 6.9 mil- lion to 8.9 million, and the number of “people for Prevalence rate based on the WHO criteria whom the possibility of diabetes cannot be pre- In 1997, the study group of the Ministry of cluded” increased from approximately 6.8 million Health, Labour and Welfare (MHLW) of Japan to 13.2 million. The sum of these two showed a compiled the results of epidemiological surveys striking increase from approximately 13.7 million conducted in 10 population groups in 7 areas to 22.1 million. Because a great majority of peo- nationwide during the period from 1975 to 1993. ple with diabetes in Japan are those with type All subjects aged 40 to 64 except for those under- 2 diabetes, this number (the sum of “people going medical care for diabetes received 75g People for whom the possibility of diabetes cannot be precluded People strongly suspected of having diabetes (%) 45 Males 40 35 30 25 20 15 10 5 0 1997 2002 2007 1997 2002 2007 1997 2002 2007 1997 2002 2007 1997 2002 2007 1997 2002 2007 (Year) Age 20–29 Age 30–39 Age 40–49 Age 50–59 Age 60–79 Age Ն70 (%) 45 40 Females 35 30 25 20 15 10 5 0 1997 2002 2007 1997 2002 2007 1997 2002 2007 1997 2002 2007 1997 2002 2007 1997 2002 2007 (Year) Age 20–29 Age 30–39 Age 40–49 Age 50–59 Age 60–79 Age Ն70 [Ministry of Health and Welfare/Ministry of Health, Labour and Welfare: National Diabetes Surveys (1997 and 2002); Ministry of Health, Labour and Welfare: National Health and Nutrition Survey (2007).] Fig. 1 Percentage of “people strongly suspected of having diabetes” (diabetes) and “people for whom the possibility of diabetes cannot be precluded” (prediabetes) by sex and age group in Japan JMAJ, January/February 2010 — Vol. 53, No. 1 37 Morimoto A, Nishimura R, Tajima N OGTT, and diabetes and impaired glucose toler- diabetes was 7.14% among males and 4.50% ance (IGT) were determined according to the among females, and the prevalence rate of IGT WHO criteria (1985). The prevalence rate of was 14.31% among males and 15.56% among females.3 This report also demonstrated the pres- ence of large regional difference in the preva- lence rates of diabetes and IGT. As for the trends in prevalence rate, the report on the analysis of 1997 2002 2007 40 epidemiological surveys conducted in Japan from 1964 to 1992 concluded that the prevalence (10,000 persons) 2,500 rate of diabetes increased from 1.8–10.8% among 2,210 males and 0.8–4.03% among females in 1964–1979 2,000 1,620 to 4.2–13.1% among males and 2.6–12.9% among 1,500 1,320 1,370 females in 1990–1992.4 However, these surveys do 1,000 890 880 not allow comparison with the above-mentioned 690 740 680 500 National Diabetes Survey and National Health and Nutrition Survey because of the difference in 0 People strongly People for whom Total the diagnostic criteria. suspected of the possibility of having diabetes diabetes cannot be precluded Type 2 Diabetes in Children [Ministry of Health and Welfare/Ministry of Health, Labour and Wel- fare: National Diabetes Surveys (1997 and 2002); Ministry of Health, The trends in the incidence rate of type 2 dia- Labour and Welfare: National Health and Nutrition Survey (2007).] betes among elementary school (6 to 12 years Fig. 2 Number of “people strongly suspected of hav- old) and junior high school students (12 to 15 ing diabetes” (diabetes) and “people for whom years old) have been investigated since the the possibility of diabetes cannot be precluded” beginning of urine glucose screening at schools (prediabetes) in Japan Junior high school students Elementary school students (Persons) 12 10 8 6 4 (Per 100,000 examinees per year) 100,000 examinees (Per 2 0 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 01 02 03 04 05 (Year) 1974 2000 [Reproduced form Urakami T: Nippon Rinsho. 2008;66 (suppl. 4):21–25.] Fig. 3 Trends in the incidence rate of type 2 diabetes among elementary school and junior high school students in Tokyo 38 JMAJ, January/February 2010 — Vol. 53, No. 1 TRENDS IN THE EPIDEMIOLOGY OF PATIENTS WITH DIABETES IN JAPAN in 1974 in Tokyo.5,6 The subjects with positive be approximately 3,300–4,600 according to the results for glucose in the morning urine were number of patients registered nationwide in the retested, and those being positive on both tests Medical Aid for Specific Chronic Disease of received OGTT. In total, 243 individuals were Children in 2000–2005. Approximately 60% of diagnosed as having type 2 diabetes during the these patients are female.7 The number of regis- 32 years up to the year 2005, and the incidence tered children with diabetes, including type 1 and rate was 2.62 (per 100,000 person-years).
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