PEOPLE aged 45 to 54 are the most likely to be admitted to psychiatric care, but those aged 20 to 24 have the highest rate of first admissions.
And more than half of all admissions last year were single people.
The statistics are in the annual report on Activities of Irish Psychiatric Units and Hospitals 2011.
There has been a decline in the numbers of people admitted to psychiatric care, down from 19,619 in 2010 to 18,992 in 2011.
Antoinette Daly, lead author of the report, said: "The main reason for the decline is likely to be the result of a growth in the delivery of mental health services in the community."