Health of the nation outcome scales evaluation in a community setting population

To explore the internal structure of the Health of the Nation Outcome Scales (HoNOS-12), proposing a shorter one-dimensional
version for routine use in community-oriented Mental Heath services.

A validation study involving four Mental Health Departments, located in the Province of Milan (Italy). Eligible patients were
outpatients and residential inpatients rated on three occasions during the year 2009, with a range of mental illnesses and
diagnoses. Methodologically, we use both exploratory factor analysis (EFA) with holdout validation and Rasch approaches and
parallel analysis.

EFA, Rasch analysis and parallel analysis demonstrate a large violation of unidimensionality. Both EFA (training sample) and
Rasch analyses yield convergent results, generating the same unidimensional abbreviated version of the HoNOS-12, resulting
in a six-item scale (HoNOS-6) which demonstrates unidimensionality, good item fit, a solid factor structure (strong loadings
and communalities) and acceptable model fit, evaluated using confirmatory factor analysis on a validation sample.

The HoNOS-12 does not measure a single, underlying construct of mental health status. Nevertheless, the instrument can be
utilized in a reduced version (HoNOS-6), as a clinically acceptable outcome scale (measuring self-perceived clinical and social
needs for community support, rather than global mental disorder) for routine use in a community setting population.