Reliability and validity of the Dutch Anxiety, Depression And Mood Scale in adults aged <50 years with intellectual disabilities

J Appl Res Intellect Disabil. 2019 May;32(3):568-574. doi: 10.1111/jar.12550. Epub 2018 Nov 20.

Abstract

Background: Reliable and valid screening instruments for depression and anxiety are needed for adults with intellectual disabilities.

Methods: Internal consistency (n = 198), inter-rater reliability (n = 41), test-retest reliability (n = 37) and criterion validity (n = 43) were studied in adults aged between 18 and 49 years. Internal consistency was also studied in a sample with epilepsy (n = 98).

Results: Internal consistencies of the Dutch ADAMS total scale and subscales were satisfactory to good (α = 0.76-0.92), as well as in the subgroup with epilepsy (α = 0.74-0.88). Inter-rater reliability and test-retest reliability were fair to excellent for the total scale (ICC's: 0.57-0.84) and subscales (ICC's: 0.43-0.86). The criterion validity of the Dutch ADAMS Depressive Mood subscale was good with a sensitivity of 88% (95% CI: 53%-98%) and a specificity of 80% (95% CI: 64%-90%).

Conclusions: Our study shows that the Dutch ADAMS is a reliable and valid instrument for adults aged between 18 and 49 years with intellectual disabilities (and comorbid epilepsy).

Keywords: anxiety; depression; intellectual disabilities; reliability; validity.

MeSH terms

  • Adolescent
  • Adult
  • Affect / physiology*
  • Anxiety / diagnosis*
  • Anxiety / epidemiology
  • Comorbidity
  • Depression / diagnosis*
  • Depression / epidemiology
  • Epilepsy / epidemiology
  • Epilepsy / psychology*
  • Female
  • Humans
  • Intellectual Disability / epidemiology
  • Intellectual Disability / psychology*
  • Male
  • Middle Aged
  • Netherlands
  • Psychiatric Status Rating Scales / standards*
  • Reproducibility of Results
  • Young Adult