| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2006: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Research Abstract |
The aim of this study was to examine the prevalence of mood disorders in a Japanese school sample of children and adolescents using the Japanese version of the Mini International Neuropsychiatric Interview for Children and Adolescents (MINI-KID). The participants consisted of 738 elementary school and junior high school students coming from Chitose city in Hokkaido, northern Japan, and psychiatrists interviewed all students.
Of the 738 fourth- to seventh-grade students, 4.2% had mood disorders: major depressive disorder (1.5%); minor depressive disorder (1.4%); dysthymic disorder (0.3%); and bipolar disorder (1.1%). Prevalence of major depressive disorder for seventh graders was 4.1%, significantly higher than that for elementary school children. In particular, prevalence of major depressive disorder for seventh-graders was high at 4.1%, comparable to that in adults. As to the relationship between mood disorders and lifestyle factors, risk of major depressive disorder was higher for girls and students who often played videogames.
The results clarified that prevalence of mood disorders in Japanese elementary and junior high school students is comparable to Western countries.
As to the diagnosis of bipolar disorder by the MINI-KID, relatively few false-positive cases were identified. Some healthy children satisfied MINI-KID criteria for mania (hypomania). Since information from parents and teachers was unavailable, no conclusive diagnosis could be made, but some false-positive children appeared to have AD/HD or Asperger syndrome. Hence, in the diagnosis of bipolar disorder, comprehensive examinations are needed by reviewing developmental history, observing behaviors, and gathering information from parents and teachers.
As to the relationship between mood disorders and lifestyle, girls and students who often play videogames appear to be at greater risk of major depressive disorder.
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