Geographic proximity is associated with transmission of suicidal behaviour among siblings.
Acta Psychiatr Scand
; 140(1): 30-38, 2019 07.
Article
em En
| MEDLINE
| ID: mdl-31102549
ABSTRACT
OBJECTIVE:
The aim of this study was to clarify the role of 'contagion', or social transmission, in risk of suicidal behaviour (SB) among siblings.METHODS:
We followed Swedish sibling pairs until one of them (S1; N = 111,848) was registered for a suicide attempt or completion. We tested the effect of geographic proximity between siblings on risk of a first SB registration of S1's sibling (S2). To control for familial confounding, we conducted complementary analyses of sibling trios (N = 701), comparing risk in different siblings as a function of their respective proximity to S1.RESULTS:
The best-fitting model across sibling pairs included an effect of distance between siblings (HR = 0.96, 95% CI = 0.93-0.99). Hazard ratios declined quickly up to 25 km and largely stabilized beyond 150 km. Across all pairs, a larger age difference between siblings was associated with reduced SB risk (HR = 0.96 95% CI = 0.93-0.98). Findings were consistent within the sibling trios.CONCLUSIONS:
Consistent with the concept of suicide contagion, risk of suicidal behaviour subsequent to a sibling's suicide completion or attempt is higher as a function of sibling closeness. These findings are robust to potentially confounding familial factors.Palavras-chave
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Tentativa de Suicídio
/
Sistema de Registros
/
Irmãos
/
Suicídio Consumado
/
Geografia
Tipo de estudo:
Etiology_studies
/
Prognostic_studies
/
Risk_factors_studies
Limite:
Adolescent
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Adult
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Female
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Humans
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Male
País como assunto:
Europa
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article