Spanish Validation of the Impact of Event Scale for People with Intellectual Disabilities, IES-ID

ABSTRACT

Introduction

The aim of this study is to validate a Spanish version of the Impact of Event Scale on People with ID (IES-ID).

Methods

IES-ID was administered to adults with ID (n = 120), analyzing internal consistency, inter-rater and test-retest reliability, criterion validity, construct validity and feasibility.

Results

Good internal consistency was found in the total of the scale (α = .91). Test-retest and inter-rater correlations yielded excellent level of agreement in the total scale. Criterion validity was significant. Regarding construct validity, the factor analysis yielded three well-defined factors and the model fit of the confirmatory factor analysis appears to be very good. Finally, the feasibility was also very good.

Conclusion

The Spanish version of the Impact of Event Scale for People with ID (IES-ID) showed adequate indexes of feasibility and reliability to assess the severity of PTSD symptoms in adults with borderline to moderate ID.

KEYWORDS:

• Assessment
• intellectual disabilities
• mental health
• Post-traumatic stress disorder
• scale
• validation

Acknowledgments

The authors warmly thank the staff, participants and relatives of the A LA PAR Foundation. We also would like to thank the original authors, James C. Hall, Laura Jobson and Peter E. Langdon, who gave the permission for the Spanish validation.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Ethical approval

The A LA PAR Foundation’s Ethical Committee approved the study. Only participants who consented to take part in the study were interviewed.

Additional information

Funding

This study was supported by a grant from Carlos III Research Institute (FIS, ref. number PIInstituto de Salud Carlos III 16/00327) through the European Regional Development Fund (ERDF).