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Search trends preceding increases in suicide: A cross-correlation study of monthly Google search volume and suicide rate using transfer function models.

Abstract：

BACKGROUND:Various associations between monthly Google search volumes (MGSVs) and monthly suicide rates (MSRs) have been reported. However, these studies often analyzed a limited number of search terms using suboptimal statistical methods. While controlling for spurious associations, this study examined a wide array of suicide-related search terms to elucidate if their MGSVs correlated with future MSRs. METHODS:MGSVs of 111 candidate suicide-related terms were calculated by averaging 10 time-series data per term obtained from Google Trends. Box-Jenkins transfer function modeling was applied to time-series data of MGSV and MSR among the total, male, and female populations of the United States between 2004 and 2017. Cross-correlation coefficients between MGSVs and MSRs were calculated at lags -3, -2, and -1. Sensitivity analysis identified cross-correlations whose direction and significance (p<0.05) persisted in two other time spans: 126 and 84 months. RESULTS:Eighty-nine terms were analyzed. MGSVs of 31 terms significantly correlated with MSRs in the total, male, or female population. In the sensitivity analysis, three terms stably exhibited significant positive correlation: "generalized anxiety disorder" (total; lag -3), "anxiety disorder" (total and male; lag -3), and "laid off" (total, male, and female; lag -2). The term sleep problem (total and female; lag -1) consistently showed significant negative correlations. LIMITATIONS:Sex- or age-specific search-volume data, lags of less than a month, and potential confounding factors of MGSV and MSR were not explored. CONCLUSIONS:trends in MGSV of four terms tend to precede changes in MSR. These terms may enable more accurate forecasting of future suicides.

journal_name

J Affect Disord

journal_title

Journal of affective disorders

authors

Lee JY

doi

10.1016/j.jad.2019.11.014

subject

Has Abstract

pub_date

2020-02-01 00:00:00

pages

155-164

eissn

0165-0327

issn

1573-2517

pii

S0165-0327(19)32357-2

journal_volume

262

pub_type

杂志文章

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