People living with psychotic illness 2010

Appendix 19. How things have changed since 1997-98

Page last updated: November 2011

The first psychosis survey was conducted in 1997-98 over four predominantly metropolitan sites in the Australian Capital Territory (Canberra), Queensland (inner and outer metropolitan areas of Brisbane and a more rural catchment), Victoria (two inner city areas in Melbourne) and Western Australia (an inner city area and several suburbs in Perth).

The total catchment population aged 18-64 years was 1,084,978 people.

The survey used the same inclusion criteria and two-phase methodology as employed in the 2010 survey. Phase I screening for psychosis took place over a 30-day census in 1997.

Screening took place in public inpatient and outpatient/ambulatory/community mental health services, private psychiatric and general practices.

Homeless people, identified as those living in marginal accommodation and not identified in other service settings, were also surveyed. These people were contacted in marginalised settings, including soup kitchens, refuges and welfare centres, in each of the sites.

The total number screened positive for psychosis was 3,800.

In Phase 2, 980 individuals were randomly selected, stratified by treatment setting, for interview from those who were screen-positive in Phase 1.

The same instruments, with some modifications, were used in both surveys: the psychosis screener for census month screening and the Diagnostic Interview for Psychosis4 for the interview, although the 2010 interview schedule included many additional questions and assessments.

Further information on the first survey and the initial findings are available in Jablensky A, McGrath J, Herrman H et al. People Living with Psychotic Illness: An Australian Study 1997-98 (1999).2