Psychiatric hospitalisation and suicide among the very old in Denmark: population-based register study.
BACKGROUND
Very old people have higher suicide rates than the younger elderly population. Psychiatric disorders are known to have a strong association with suicide among elderly people.


OBJECTIVE
To analyse the analyse the suicide risk associated with psychiatric hospitalisation among the very old (> or =80 years) compared with the middle-aged (50-64 years) and old (65-79 years) populations.


METHODS
Individual-level data on the entire Danish population aged 50 years or over were analysed for the period 1994-1998. Relative suicide risks were calculated using event-history analysis.


RESULTS
Among 1978 527 persons, 2323 died by suicide. Although the very old group exhibited a four-fold to five-fold increase in risk of suicide for those previously hospitalised, we noted an inverse interaction effect: the increase is distinctly smaller compared with that in the middle-aged and old groups.


CONCLUSIONS
The association between suicide and psychiatric hospitalisation is much weaker for the very old than for the old. Psychiatric disorders among very old people may be interacting with other disorders, may be underdiagnosed or treated in other healthcare settings.
National Centre for Register-based Research, University of Aarhus, Taasingegade 1, DK-8000 Aarhus C, Denmark. aer@ncrr.dk
Annette
A
Erlangsen
Preben Bo
PB
Mortensen
Werner
W
Vach
Bernard
B
Jeune
D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D003718:Denmark / Q000453:epidemiology; D005260:Female; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000453:epidemiology / Q000523:psychology*; D008875:Middle Aged; D012042:Registries; D018570:Risk Assessment; D012737:Sex Factors; D013405:Suicide / Q000706:statistics & numerical data*