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Alzheimers Dement (Amst). 2019 Jan 2;11:45-52. doi: 10.1016/j.dadm.2018.11.001. eCollection 2019 Dec.

The social functioning in dementia scale (SF-DEM): Exploratory factor analysis and psychometric properties in mild, moderate, and severe dementia.

Author information

1
Division of Psychiatry, University College London, London, UK.
2
Camden and Islington NHS Foundation Trust, St Pancras Hospital, London, UK.
3
School of Psychology, University of Kent, Canterbury, UK.
4
Centre for Dementia Studies, Brighton and Sussex Medical School, University of Sussex, Brighton, East Sussex, UK.

Abstract

Introduction:

The psychometric properties of the social functioning in dementia scale over different dementia severities are unknown.

Methods:

We interviewed 299 family carers of people with mild, moderate, or severe dementia from two UK research sites; examined acceptability (completion rates); conducted exploratory factor analysis; and tested each factor's internal consistency and construct validity.

Results:

Of 299, 285 (95.3%) carers completed questionnaires. Factor analysis indicated three distinct factors with acceptable internal consistency: spending time with other people, correlating with overall social function (r = 0.56, P < .001) and activities of daily living (r = -0.48, P < .001); communicating with other people correlating with activities of daily living (r = -0.66, P < .001); and sensitivity to other people correlating with quality of life (r = 0.35, P < .001) and inversely with neuropsychiatric symptoms (r = -0.45, P < .001). The three factors' correlations with other domains were similar across all dementia severities.

Discussion:

The social functioning in dementia scale carer version measures three social functioning domains and has satisfactory psychometric properties in all severities of dementia.

KEYWORDS:

Behavior Rating Scale; Dementia; Factor analysis; Psychometrics; Social behaviour

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