Low Vitamin D Status and Suicide: A Case-Control Study of Active Duty Military Service Members
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{"title"=>"Low Vitamin D Status and Suicide: A Case-Control Study of Active Duty Military Service Members", "type"=>"journal", "authors"=>[{"first_name"=>"John C.", "last_name"=>"Umhau", "scopus_author_id"=>"6602749338"}, {"first_name"=>"David T.", "last_name"=>"George", "scopus_author_id"=>"7201471514"}, {"first_name"=>"Robert P.", "last_name"=>"Heaney", "scopus_author_id"=>"20334262300"}, {"first_name"=>"Michael D.", "last_name"=>"Lewis", "scopus_author_id"=>"22975932800"}, {"first_name"=>"Robert J.", "last_name"=>"Ursano", "scopus_author_id"=>"7005305249"}, {"first_name"=>"Markus", "last_name"=>"Heilig", "scopus_author_id"=>"7004376513"}, {"first_name"=>"Joseph R.", "last_name"=>"Hibbeln", "scopus_author_id"=>"7003899953"}, {"first_name"=>"Melanie L.", "last_name"=>"Schwandt", "scopus_author_id"=>"6602357043"}], "year"=>2013, "source"=>"PLoS ONE", "identifiers"=>{"pui"=>"368048110", "issn"=>"19326203", "isbn"=>"1932-6203 (Electronic)\\r1932-6203 (Linking)", "doi"=>"10.1371/journal.pone.0051543", "scopus"=>"2-s2.0-84871857314", "pmid"=>"23308099", "sgr"=>"84871857314"}, "id"=>"80cb3576-804d-3c8f-93ed-f8fe89d0d450", "abstract"=>"OBJECTIVE: Considering that epidemiological studies show that suicide rates in many countries are highest in the spring when vitamin D status is lowest, and that low vitamin D status can affect brain function, we sought to evaluate if a low level of 25-hydroxyvitamin D [25(OH)D] could be a predisposing factor for suicide.\\n\\nMETHOD: We conducted a prospective, nested, case-control study using serum samples stored in the Department of Defense Serum Repository. Participants were previously deployed active duty US military personnel (2002-2008) who had a recent archived serum sample available for analysis. Vitamin D status was estimated by measuring 25(OH) D levels in serum samples drawn within 24 months of the suicide. Each verified suicide case (n = 495) was matched to a control (n = 495) by rank, age and sex. We calculated odds ratio of suicide associated with categorical levels (octiles) of 25(OH) D, adjusted by season of serum collection.\\n\\nFINDINGS: More than 30% of all subjects had 25(OH)D values below 20 ng/mL. Although mean serum 25(OH)D concentrations did not differ between suicide cases and controls, risk estimates indicated that subjects in the lowest octile of season-adjusted 25(OH)D (<15.5 ng/mL) had the highest risk of suicide, with subjects in the subsequent higher octiles showing approximately the same level of decreased risk (combined odds ratio compared to lowest octile = 0.49; 95% C.I.: 0.315-0.768).\\n\\nCONCLUSIONS: Low vitamin D status is common in active duty service members. The lowest 25(OH)D levels are associated with an increased risk for suicide. Future studies could determine if additional sunlight exposure and vitamin D supplementation might reduce suicide by increasing 25(OH) D levels.", "link"=>"http://www.mendeley.com/research/low-vitamin-d-status-suicide-casecontrol-study-active-duty-military-service-members-5", "reader_count"=>40, "reader_count_by_academic_status"=>{"Unspecified"=>1, "Professor > Associate Professor"=>2, "Librarian"=>3, "Student > Doctoral Student"=>2, "Researcher"=>8, "Student > Ph. D. Student"=>6, "Student > Postgraduate"=>3, "Other"=>4, "Student > Master"=>5, "Student > Bachelor"=>5, "Lecturer"=>1}, "reader_count_by_user_role"=>{"Unspecified"=>1, "Professor > Associate Professor"=>2, "Librarian"=>3, "Student > Doctoral Student"=>2, "Researcher"=>8, "Student > Ph. D. Student"=>6, "Student > Postgraduate"=>3, "Other"=>4, "Student > Master"=>5, "Student > Bachelor"=>5, "Lecturer"=>1}, "reader_count_by_subject_area"=>{"Unspecified"=>2, "Environmental Science"=>1, "Biochemistry, Genetics and Molecular Biology"=>1, "Nursing and Health Professions"=>2, "Medicine and Dentistry"=>17, "Agricultural and Biological Sciences"=>5, "Neuroscience"=>1, "Sports and Recreations"=>1, "Chemistry"=>3, "Psychology"=>2, "Social Sciences"=>4, "Computer Science"=>1}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>17}, "Neuroscience"=>{"Neuroscience"=>1}, "Chemistry"=>{"Chemistry"=>3}, "Social Sciences"=>{"Social Sciences"=>4}, "Sports and Recreations"=>{"Sports and Recreations"=>1}, "Psychology"=>{"Psychology"=>2}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>5}, "Computer Science"=>{"Computer Science"=>1}, "Nursing and Health Professions"=>{"Nursing and Health Professions"=>2}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>1}, "Unspecified"=>{"Unspecified"=>2}, "Environmental Science"=>{"Environmental Science"=>1}}, "reader_count_by_country"=>{"South Korea"=>1, "United States"=>2, "United Kingdom"=>1, "Australia"=>1, "Germany"=>1}, "group_count"=>6}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/512380"], "description"=>"<p>The vertical lines at each point represent the 95% confidence intervals for each odds ratio, (see <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0051543#pone-0051543-t002\" target=\"_blank\">Table 2</a>, footnote 1). The dashed line is the least squares fit of the 8 values to the equation: OR = 0.48 + 10,220 exp (−0.9893X), which is the expression best suited to describe nutrient effect as a function of intake. As is visually apparent, the regression line falls within the confidence limits for 6 of the 7 octiles above the first. (Copyright, Robert P. Heaney, 2012. Used with permission.).</p>", "links"=>[], "tags"=>["computed", "ratios", "octiles", "locating", "mid-point", "respective"], "article_id"=>182856, "categories"=>["Neuroscience", "Mental Health", "Biotechnology"], "users"=>["John C. Umhau", "David T. George", "Robert P. Heaney", "Michael D. Lewis", "Robert J. Ursano", "Markus Heilig", "Joseph R. Hibbeln", "Melanie L. Schwandt"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0051543.g001", "stats"=>{"downloads"=>1, "page_views"=>17, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Plot_of_the_computed_odds_ratios_OR_for_the_8_octiles_of_25_OH_D_concentration_locating_each_at_the_mid_point_of_the_respective_octiles_/182856", "title"=>"Plot of the computed odds ratios (OR) for the 8 octiles of 25(OH)D concentration, locating each at the mid-point of the respective octiles.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-19 17:30:01"}
  • {"files"=>["https://ndownloader.figshare.com/files/512437"], "description"=>"<p>OR = 0.49 (95% C.I. 0.315–0.768).</p>", "links"=>[], "tags"=>["lowest"], "article_id"=>182933, "categories"=>["Neuroscience", "Mental Health", "Biotechnology"], "users"=>["John C. Umhau", "David T. George", "Robert P. Heaney", "Michael D. Lewis", "Robert J. Ursano", "Markus Heilig", "Joseph R. Hibbeln", "Melanie L. Schwandt"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0051543.g002", "stats"=>{"downloads"=>1, "page_views"=>9, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Plot_of_the_odds_ratio_for_suicide_for_the_top_seven_octiles_relative_to_the_lowest_octile_/182933", "title"=>"Plot of the odds ratio for suicide for the top seven octiles, relative to the lowest octile.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-19 17:30:27"}
  • {"files"=>["https://ndownloader.figshare.com/files/512521"], "description"=>"1<p>Octiles were calculated from waveform adjusted 25(OH)D levels based on the distribution of the control subjects. Cutoff 25-hydroxyvitamin D values were as follows. octile 1: ≤15.5; octile 2: 15.6–18.8; octile 3: 18.9–21.2; octile 4: 21.3–22.9; octile 5: 23.0–25.4; octile 6: 25.5–29.2; octile 7: 29.3–36.0; octile 8: >36.0.</p>2<p>Odds ratio based on the comparison of African American vs. Non-African American.</p>", "links"=>[], "tags"=>["conditional", "logistic", "regression"], "article_id"=>183011, "categories"=>["Neuroscience", "Mental Health", "Biotechnology"], "users"=>["John C. Umhau", "David T. George", "Robert P. Heaney", "Michael D. Lewis", "Robert J. Ursano", "Markus Heilig", "Joseph R. Hibbeln", "Melanie L. Schwandt"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0051543.t002", "stats"=>{"downloads"=>2, "page_views"=>4, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Results_of_the_conditional_logistic_regression_analysis_including_covariates_/183011", "title"=>"Results of the conditional logistic regression analysis including covariates.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-02-19 17:30:57"}
  • {"files"=>["https://ndownloader.figshare.com/files/512487"], "description"=>"1<p>To convert to nanomoles per liter, multiply by 2.496.</p>2<p>There was no significant difference between suicide cases and matched controls in 25(OH)D levels, either not adjusted for season of blood sample collection (t<sub>494</sub>  = 0.41, p = 0.68), or adjusted for season of blood sample collection using a waveform algorithm (t<sub>494</sub> = 0.43, p = 0.67).</p>3<p>Only bimonthly categories were available for season of blood draw, as the dates of both blood collection and of suicide were provided from AFHSC in two month intervals to preserve anonymity of the suicide casualties.</p>4<p>Significant difference between suicide cases and matched controls based on a paired t-test (t<sub>494</sub> = 3.68, p = 0.0003).</p>5<p>Significant difference in frequency between cases and matched controls (X<sup>2</sup> = 12.2, p = 0.0005).</p>", "links"=>[], "tags"=>["plasma", "levels", "baseline", "characteristics", "cases"], "article_id"=>182977, "categories"=>["Neuroscience", "Mental Health", "Biotechnology"], "users"=>["John C. Umhau", "David T. George", "Robert P. Heaney", "Michael D. Lewis", "Robert J. Ursano", "Markus Heilig", "Joseph R. Hibbeln", "Melanie L. Schwandt"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0051543.t001", "stats"=>{"downloads"=>1, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Mean_plasma_25_OH_D_levels_and_baseline_characteristics_for_cases_and_controls_/182977", "title"=>"Mean plasma 25(OH)D levels and baseline characteristics for cases and controls.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-02-19 17:30:44"}
  • {"files"=>["https://ndownloader.figshare.com/files/512556"], "description"=>"1<p>Octiles were calculated from waveform adjusted 25(OH)D levels based on the distribution of the control subjects. Cutoff 25-hydroxyvitamin D values were as follows. octile 1: ≤15.5; octile 2: 15.6–18.8; octile 3: 18.9–21.2; octile 4: 21.3–22.9; octile 5: 23.0–25.4; octile 6: 25.5–29.2; octile 7: 29.3–36.0; octile 8: >36.0.</p>", "links"=>[], "tags"=>["conditional", "logistic", "regression"], "article_id"=>183049, "categories"=>["Neuroscience", "Mental Health", "Biotechnology"], "users"=>["John C. Umhau", "David T. George", "Robert P. Heaney", "Michael D. Lewis", "Robert J. Ursano", "Markus Heilig", "Joseph R. Hibbeln", "Melanie L. Schwandt"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0051543.t003", "stats"=>{"downloads"=>1, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Results_of_the_conditional_logistic_regression_analysis_not_including_covariates_/183049", "title"=>"Results of the conditional logistic regression analysis not including covariates.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-02-19 17:31:09"}

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Relative Metric

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