著者

Yuri Murayama Ken Inoue Chiho Yamazaki Satomi Kameo Minato Nakazawa Hiroshi Koyama

出版者

Tohoku University Medical Press

雑誌

The Tohoku Journal of Experimental Medicine (ISSN:00408727)

巻号頁・発行日

vol.249, no.2, pp.101-111, 2019 (Released:2019-10-22)

参考文献数

44

被引用文献数

6

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For the prevention of suicides, the early detection of depression symptoms and the implementation of suicide prevention measures based on the local community’s conditions are critical. In rural or remote communities with poor access to urban areas, the medical care is often insufficient. We conducted the present study to investigate the relationship between depressive state and social-environmental factors in a depopulated inland rural area in central Japan, where the suicide rate is high and specialized psychiatric care is not available. Using a correspondence analysis, logistic regression analysis, and structural equation modeling (SEM), we examined the questionnaire responses of 912 residents (average 60.5 years old). Total Health Index-Depression (THI-D) scale scores were used to measure depressive state. The lifestyle-related factor with the strongest link to depressive state was ‘concerns about interpersonal relationships’ (OR = 2.7, 95% CI: 2.06-3.53, p < 0.0001), whereas financial concerns, number of friends, exercise habits, and perceived amount of sleep were also useful for predicting depressive state. The SEM showed that one’s job and private life, particularly concerns about interpersonal relationships, are correlated with higher THI-D scores. Thus, social and lifestyle factors (e.g., concerns about interpersonal relationships and financial situation) can be used to predict depressive state in a depopulated rural area, and the newly revealed order in which depressive symptoms manifest is important. Our findings can be used to advance assessments of depressive symptoms and will be useful for mental health and suicide prevention.

著者

Takeo Kurihara Reiko Fuseya Masaya Katoh Ken Inoue

出版者

The Plankton Society of Japan, The Japanese Association of Benthology

雑誌

Plankton and Benthos Research (ISSN:18808247)

巻号頁・発行日

vol.5, no.1, pp.11-16, 2010-02-25 (Released:2010-06-25)

参考文献数

19

被引用文献数

5 7

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Giant clams are simultaneous hermaphrodites and are assumed to ejaculate first and, after completely stopping ejaculation, release eggs. In the seed production method aimed at preventing self-fertilization, each adult clam is induced to ejaculate in a tank and then release eggs in another tank. Giant clams, however, have recently been suggested to continue ejaculation for a period after the beginning of egg release. The overlap between ejaculation and egg release might lead to self-fertilization in the tank used for egg release, especially for the eggs released just at the beginning of spawning. We examined the possibility of such self-fertilization for the giant clam Tridacna crocea and obtained three results. (1) In observations with the naked eye in a laboratory, 2 of 38 T. crocea simultaneously ejaculated and released eggs. (2) In a laboratory experiment, 1.5 to 80.0% of eggs released from each adult clam developed into D-shaped larvae without artificial cross-fertilization. Such development occurred more frequently for the eggs released earlier from each adult clam than for the eggs released later from the clam. (3) In observations at a hatchery, 2 to 94% of the eggs released from 4 of 5 adults were found to develop into D-shaped larvae without artificial cross-fertilization. The three results suggest that at least some T. crocea adults continue ejaculation for a period after starting spawning eggs, which causes self-fertilization.

著者

Ken INOUE Hisashi TANII Tatsushige FUKUNAGA Shuntaro ABE Yukika NISHIMURA Hisanobu KAIYA Masayuki NATA Yuji OKAZAKI

出版者

National Institute of Occupational Safety and Health

雑誌

Industrial Health (ISSN:00198366)

巻号頁・発行日

vol.45, no.1, pp.177-180, 2007 (Released:2007-02-07)

参考文献数

15

被引用文献数

6 7

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The number of suicides in Japan has increased from approximately 22,000 per year in 1988-1997 to over 30,000 per year since then. It has also increased in Mie prefecture during that period. In the present study, we investigated the correlation between annual suicide rates in Mie prefecture, Japan from 1996-2002 and the annual unemployment rate in Japan from 1996-2002 among males. Among the results, annual suicide rates in total correlated with the unemployment rate in Japan, but the relation was not statistically significant: r(7)=0.76, r2(7)=0.58, p=0.05 (y=3.54x+6.37); the rates in males, however, correlated significantly with the unemployment rate in Japan: r(7)=0.85, r2(7)=0.73, p=0.01 (y=5.72x+4.49). In addition, we found that annual suicide rates in total correlated significantly with the male unemployment rates. When a patient is unemployed and in a bad situation, the medical staff and the family should be aware of the correspondence between suicide rates and unemployment.