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An analysis of secular trends in method-specific suicides in Japan, 1950 – 1975

View Article: PubMed Central - PubMed

ABSTRACT

Background: In Japan, a dramatic rise in suicide rates was observed in the 1950s, especially among the younger population, and then the rate decreased rapidly again in the 1960s. The aim of this study was to assess secular trends in method-specific suicides by gender and age in Japan between 1950 and 1975. We paid special attention to suicides by poisoning (solid and liquid substances), and their contribution to dramatic swings in the overall suicide rate in Japan during the 1950s and 1960s.

Methods: Mortality and population data were obtained from the Vital Statistics of Japan and Statistics Bureau, Ministry of Internal Affairs and Communications in Japan, respectively. We calculated method-specific age-standardized suicide rates by gender and age group (15–29, 30–49, or 50+ years).

Results: The change in the suicide rate during the research period was larger in males than females in all age groups, and was more marked among people aged 15–29 years compared to those aged 30–49 years and 50 years or over. Poisoning by solid and liquid substances overwhelmingly contributed to the dramatic change in the overall suicide rates in males and females aged 15–49 years in the 1950s and 1960s. For the peak years of the rise in poisoning suicides, bromide was the most frequently used substance.

Conclusions: Our results for the 1950s and 1960s in Japan illustrated how assessing secular trends in method-specific suicides by gender and age could provide a deeper understanding of the dramatic swings in overall suicide rate. Although rapid increases or decreases in suicide rates have been also observed in some countries or regions recently, trends in method-specific suicides have not been analyzed because of a lack of data on method-specific suicide in many countries. Our study illustrates how the collection and analysis of method-specific data can contribute to an understanding of dramatic shifts in national suicide rates.

No MeSH data available.


Related in: MedlinePlus

Secular trends in age-standardized suicide rates for females by age and method used in Japan, 1952–1975 (3-year moving averages)
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Fig2: Secular trends in age-standardized suicide rates for females by age and method used in Japan, 1952–1975 (3-year moving averages)

Mentions: Figures 1 and 2 show secular trends in age-standardized suicide rates by age and method used in Japan during the research period for males and females, respectively. For males and females aged 15–29 years, suicide rates for poisoning increased in the early 1950s, reached a peak in the late 1950s, and then decreased from the 1960s onward. In this age group, poisoning was the overwhelmingly dominant method in both genders from the early 1950s through the early 1960s. Dramatic changes in overall suicide rates were also observed in the 1950s and 1960s, and the overall suicide rates were almost parallel to the poisoning rates during this period. Although the overall (as well as) poisoning suicide rates of males were much higher than those of females, the secular trends showed similar tendencies between males and females in this age group. For males and females aged 30–49 and 50+ years, similar changes in poisoning suicide rates in the 1950s and 1960s were observed, although they were less marked than the trends among 15–29 year olds. Hanging was by far the most common method in those aged 50+ years during the research period.Fig. 1


An analysis of secular trends in method-specific suicides in Japan, 1950 – 1975
Secular trends in age-standardized suicide rates for females by age and method used in Japan, 1952–1975 (3-year moving averages)
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC5382522&req=5

Fig2: Secular trends in age-standardized suicide rates for females by age and method used in Japan, 1952–1975 (3-year moving averages)
Mentions: Figures 1 and 2 show secular trends in age-standardized suicide rates by age and method used in Japan during the research period for males and females, respectively. For males and females aged 15–29 years, suicide rates for poisoning increased in the early 1950s, reached a peak in the late 1950s, and then decreased from the 1960s onward. In this age group, poisoning was the overwhelmingly dominant method in both genders from the early 1950s through the early 1960s. Dramatic changes in overall suicide rates were also observed in the 1950s and 1960s, and the overall suicide rates were almost parallel to the poisoning rates during this period. Although the overall (as well as) poisoning suicide rates of males were much higher than those of females, the secular trends showed similar tendencies between males and females in this age group. For males and females aged 30–49 and 50+ years, similar changes in poisoning suicide rates in the 1950s and 1960s were observed, although they were less marked than the trends among 15–29 year olds. Hanging was by far the most common method in those aged 50+ years during the research period.Fig. 1

View Article: PubMed Central - PubMed

ABSTRACT

Background: In Japan, a dramatic rise in suicide rates was observed in the 1950s, especially among the younger population, and then the rate decreased rapidly again in the 1960s. The aim of this study was to assess secular trends in method-specific suicides by gender and age in Japan between 1950 and 1975. We paid special attention to suicides by poisoning (solid and liquid substances), and their contribution to dramatic swings in the overall suicide rate in Japan during the 1950s and 1960s.

Methods: Mortality and population data were obtained from the Vital Statistics of Japan and Statistics Bureau, Ministry of Internal Affairs and Communications in Japan, respectively. We calculated method-specific age-standardized suicide rates by gender and age group (15–29, 30–49, or 50+ years).

Results: The change in the suicide rate during the research period was larger in males than females in all age groups, and was more marked among people aged 15–29 years compared to those aged 30–49 years and 50 years or over. Poisoning by solid and liquid substances overwhelmingly contributed to the dramatic change in the overall suicide rates in males and females aged 15–49 years in the 1950s and 1960s. For the peak years of the rise in poisoning suicides, bromide was the most frequently used substance.

Conclusions: Our results for the 1950s and 1960s in Japan illustrated how assessing secular trends in method-specific suicides by gender and age could provide a deeper understanding of the dramatic swings in overall suicide rate. Although rapid increases or decreases in suicide rates have been also observed in some countries or regions recently, trends in method-specific suicides have not been analyzed because of a lack of data on method-specific suicide in many countries. Our study illustrates how the collection and analysis of method-specific data can contribute to an understanding of dramatic shifts in national suicide rates.

No MeSH data available.


Related in: MedlinePlus