Depression, anxiety, and relevant cognitions in persons with mental retardation.

Glenn et al. (2003) asked 46 adults with mild-moderate intellectual disability to fill out shortened, plain-language versions of two common mood scales.

The team wanted to know if these easy-read forms could still show the difference between depression thoughts and anxiety thoughts.

The adults could answer the forms just fine, and their depression and anxiety scores moved up and down together.

Negative thoughts predicted bad mood, but the same thoughts showed up for both depression and anxiety, so the two feelings were hard to pull apart.

Johnson et al. (1994) already showed that people with ID can give steady self-reports on mood; Elizabeth’s team proved the same thing with newer, shorter forms.

Kooijmans et al. (2024) now offers an even better way: they added picture cues and larger fonts and got closer agreement with carers, so the 2003 method has been upgraded.

Heiman (2001) looked at students aged 8-18 and found that school setting, not thoughts, predicted mood; the adult focus on overlapping depression-anxiety thoughts does not clash—it just shows that age and place change what matters most.

You can trust brief, simplified mood scales with adults who have mild-moderate ID, but don’t expect clean labels of “depressed” versus “anxious.” Use the total distress score to flag clients who need more help, then dig into daily events and coping thoughts during your interview.