Do health and social support and personal autonomy have an influence on the health-related quality of life of individuals with intellectual disability?

BACKGROUND: The aim of this study was to assess the relation between perceived social support and personal autonomy of individuals with intellectual disabilities and Health-Related Quality of Life. METHODS: A cross-sectional study with a multicentre sample was carried out including 162 institutionalized individuals with intellectual disability. The measurement tool was a structured questionnaire with sociodemographic variables, and three scales: Functional Independence Measure(FIM) scale, Duke-UNC Functional Social Support Questionnaire, and SF-36 Health Survey, which were completed during an individual/family interview. RESULTS: The perception of received social support is high on all 11 items of the Duke-UNC questionnaire, with an average of 3.45 for item-1 and 4.85 for item-11, which represents a total perceived support of an average 47.98 points (±SD7.30) (normal support). The Mental-Health component is rated worse than Physical-Health (67.41 vs. 71.74). The average rates for the different dimensions range from 57.34 points for Social-Functioning (the lowest rating) to 79.61 points for Bodily-Pain (highest rating). A multiple linear regression analysis reveals that the dimensions of Physical-Functioning (p < 0.001), Role-Physical (p = 0.016) and Bodily-Pain (p = 0.022), which are elements of the Physical-Health component, are independent predictive variables with the Degree of Autonomy (FIM) as a dependent variable. Social-Support (Duke-UNC) as a dependent variable is determined by the dimensions of Vitality (p = 0.014), Role-Emotional (p = 0.001) and Mental-Health (p < 0.001), which are part of the Mental-Health component and act as independent predictive variables. CONCLUSIONS: Individuals with intellectual disability and a higher degree of personal autonomy determined by institutional and family support report better Health and Quality of Life. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1186/s12913-018-3856-5) contains supplementary material, which is available to authorized users.