Global incidence of suicide among Indigenous peoples: a systematic review.

BACKGROUND: Suicide is the second leading cause of death among adolescents worldwide, and is a major driver of health inequity among Indigenous people in high-income countries. However, little is known about the burden of suicide among Indigenous populations in low- and middle-income nations, and no synthesis of the global data is currently available. Our objective was to examine the global incidence of suicide among Indigenous peoples and assess disparities through comparisons with non-Indigenous populations. METHODS: We conducted a systematic review of suicide rates among Indigenous peoples worldwide and assessed disparities between Indigenous and non-Indigenous populations. We performed text word and Medical Subject Headings searches in PubMed, MEDLINE, Embase, Cumulative Index of Nursing and Allied Health (CINAHL), PsycINFO, Latin American and Caribbean Health Sciences Literature (LILACS), and Scientific Electronic Library Online (SciELO) for observational studies in any language, indexed from database inception until June 1, 2017. Eligible studies examined crude or standardized suicide rates in Indigenous populations at national, regional, or local levels, and examined rate ratios for comparisons to non-Indigenous populations. RESULTS: The search identified 13,736 papers and we included 99. Eligible studies examined suicide rates among Indigenous peoples in 30 countries and territories, though the majority focused on populations in high-income nations. Results showed that suicide rates are elevated in many Indigenous populations worldwide, though rate variation is common, and suicide incidence ranges from 0 to 187.5 suicide deaths per 100,000 population. We found evidence of suicide rate parity between Indigenous and non-Indigenous populations in some contexts, while elsewhere rates were more than 20 times higher among Indigenous peoples. CONCLUSIONS: This review showed that suicide rates in Indigenous populations vary globally, and that suicide rate disparities between Indigenous and non-Indigenous populations are substantial in some settings but not universal. Including Indigenous identifiers and disaggregating national suicide mortality data by geography and ethnicity will improve the quality and relevance of evidence that informs community, clinical, and public health practice in Indigenous suicide prevention.

Social inequalities in early childhood health and development: a European-wide systematic review.

The evidence examining the relationship between specific social factors and early childhood health and developmental outcomes has never been systematically collated or synthesized. This review aims to identify the key social factors operating at the household, neighborhood, and country levels that drive inequalities in child health and development. Medline and CHICOS (a European child-cohort inventory) were systematically searched to identify all European studies published within the past 10 y. 13,270 Medline articles and 77 European child cohorts were searched, identifying 201 studies from 32 European countries. Neighborhood deprivation, lower parental income/wealth, educational attainment, and occupational social class, higher parental job strain, parental unemployment, lack of housing tenure, and household material deprivation were identified as the key social factors associated with a wide range of adverse child health and developmental outcomes. Similar association trends were observed across most European countries, with only minor country-level differences. Multiple adverse social factors operating at both the household and neighborhood levels are independently associated with a range of adverse health and developmental outcomes throughout early childhood. The social gradient in health and developmental outcomes observed throughout the remaining life course may be partly explained by gradients initiated in early childhood.