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Age and gender differences in the association between body mass index and all-cause mortality among older Japanese.

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Title: Age and gender differences in the association between body mass index and all-cause mortality among older Japanese.
Authors: Murayama, Hiroshi, Liang, Jersey, Shaw, Benjamin A., Botoseneanu, Anda, Kobayashi, Erika, Fukaya, Taro, Shinkai, Shoji
Source: Ethnicity & Health. Aug2020, Vol. 25 Issue 6, p874-887. 14p. 4 Charts.
Subjects: Age distribution, Confidence intervals, Mortality, Research funding, Sex distribution, Body mass index, Proportional hazards models, Data analysis software, Descriptive statistics
Geographic Terms: Japan
Abstract: Objective: Increasing evidence suggests a reverse J-shaped association between body mass index (BMI) and all-cause mortality among the older population. However, findings from non-Western societies including Japan are still sparse. Furthermore, little evidence regarding variation by age and gender in the BMI-mortality relationship in old age exists. This study aimed to examine age and gender variations in the relationship between BMI and all-cause mortality among older Japanese. Design: Data came from a national representative sample of community-dwelling Japanese aged 60 years and older at baseline (n = 4,869). Participants were followed for up to 25 years. We categorized BMI into seven categories: < 18.5, 18.5–19.9, 20.0–21.4, 21.5–22.9, 23.0–24.9, 25.0–26.9, and ≥ 27.0. Cox proportional hazards models were used to assess the relative mortality risk associated with BMI categories. Results: Lower BMI (< 18.5 and 18.5–19.9) was associated with higher mortality, compared to the mid-normal weight category (BMI: 21.5–22.9), after adjusting for covariates. In contrast, high-normal weight (BMI: 23.0–24.9) and overweight (BMI: 25.0–26.9 and ≥ 27.0) were not associated with mortality. Relative to old-old (aged ≥ 75 years), the higher mortality risk associated with lower BMI (< 20) appeared to be more prominent among young-old (aged 60–74 years). A moderately increased mortality risk associated with low BMI (18.5–19.9) was identified among men but not among women. Conclusion: Among older Japanese, low BMI (< 20.0) was associated with higher mortality, while high BMI (≥ 27.0) was not. The increased mortality risk associated with low BMI is more apparent among young-old and men. These age and gender differences need to be considered in assessing healthy body weight in old age. [ABSTRACT FROM AUTHOR]
Copyright of Ethnicity & Health is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Age and gender differences in the association between body mass index and all-cause mortality among older Japanese.
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Murayama%2C+Hiroshi%22&quot;&gt;Murayama, Hiroshi&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Liang%2C+Jersey%22&quot;&gt;Liang, Jersey&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Shaw%2C+Benjamin+A%2E%22&quot;&gt;Shaw, Benjamin A.&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Botoseneanu%2C+Anda%22&quot;&gt;Botoseneanu, Anda&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Kobayashi%2C+Erika%22&quot;&gt;Kobayashi, Erika&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Fukaya%2C+Taro%22&quot;&gt;Fukaya, Taro&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Shinkai%2C+Shoji%22&quot;&gt;Shinkai, Shoji&lt;/searchLink&gt;
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Ethnicity+%26+Health%22&quot;&gt;Ethnicity &amp; Health&lt;/searchLink&gt;. Aug2020, Vol. 25 Issue 6, p874-887. 14p. 4 Charts.
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  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Japan%22&quot;&gt;Japan&lt;/searchLink&gt;
– Name: Abstract
  Label: Abstract
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  Data: Objective: Increasing evidence suggests a reverse J-shaped association between body mass index (BMI) and all-cause mortality among the older population. However, findings from non-Western societies including Japan are still sparse. Furthermore, little evidence regarding variation by age and gender in the BMI-mortality relationship in old age exists. This study aimed to examine age and gender variations in the relationship between BMI and all-cause mortality among older Japanese. Design: Data came from a national representative sample of community-dwelling Japanese aged 60 years and older at baseline (n = 4,869). Participants were followed for up to 25 years. We categorized BMI into seven categories: &lt; 18.5, 18.5–19.9, 20.0–21.4, 21.5–22.9, 23.0–24.9, 25.0–26.9, and ≥ 27.0. Cox proportional hazards models were used to assess the relative mortality risk associated with BMI categories. Results: Lower BMI (&lt; 18.5 and 18.5–19.9) was associated with higher mortality, compared to the mid-normal weight category (BMI: 21.5–22.9), after adjusting for covariates. In contrast, high-normal weight (BMI: 23.0–24.9) and overweight (BMI: 25.0–26.9 and ≥ 27.0) were not associated with mortality. Relative to old-old (aged ≥ 75 years), the higher mortality risk associated with lower BMI (&lt; 20) appeared to be more prominent among young-old (aged 60–74 years). A moderately increased mortality risk associated with low BMI (18.5–19.9) was identified among men but not among women. Conclusion: Among older Japanese, low BMI (&lt; 20.0) was associated with higher mortality, while high BMI (≥ 27.0) was not. The increased mortality risk associated with low BMI is more apparent among young-old and men. These age and gender differences need to be considered in assessing healthy body weight in old age. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: &lt;i&gt;Copyright of Ethnicity &amp; Health is the property of Taylor &amp; Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1080/13557858.2018.1469737
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 14
        StartPage: 874
    Subjects:
      – SubjectFull: Age distribution
        Type: general
      – SubjectFull: Confidence intervals
        Type: general
      – SubjectFull: Mortality
        Type: general
      – SubjectFull: Research funding
        Type: general
      – SubjectFull: Sex distribution
        Type: general
      – SubjectFull: Body mass index
        Type: general
      – SubjectFull: Proportional hazards models
        Type: general
      – SubjectFull: Data analysis software
        Type: general
      – SubjectFull: Descriptive statistics
        Type: general
      – SubjectFull: Japan
        Type: general
    Titles:
      – TitleFull: Age and gender differences in the association between body mass index and all-cause mortality among older Japanese.
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            NameFull: Murayama, Hiroshi
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            NameFull: Liang, Jersey
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            NameFull: Shaw, Benjamin A.
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              Text: Aug2020
              Type: published
              Y: 2020
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