Characteristics of instruments screening for depression in adults with intellectual disabilities: systematic review.

Hermans et al. (2010) hunted for every paper that tested a depression screen made for adults with intellectual disabilities. They kept only studies that reported reliability or validity numbers. In the end they compared four tools: one self-report scale and three caregiver forms.

The Glasgow Depression Scale for people with ID came out on top when clients could answer for themselves. For adults who cannot self-report, three caregiver checklists looked useful but had thinner evidence. Every tool still needs bigger follow-up studies.

Dewsbury (2003) already warned that no gold-standard depression test exists for this group. Hermans et al. (2010) agree, but move the field forward by naming the best current options instead of leaving clinicians empty-handed.

Rojahn et al. (1994) showed that different depression screens often disagree in the same clients. The 2010 review explains why: most tools were never re-tested in new samples, so their cut-off scores remain shaky.

Ahlborn et al. (2008) built a short carer checklist and found good internal consistency. Heidi’s team later included that checklist in their evidence table, giving it a stamp of ‘promising but needs more work’.

If you support adults with ID, you now have a clear shortlist. Start with the Glasgow Depression Scale when the person can reply. If not, pick one of the three caregiver tools the review highlights, track scores over time, and stay cautious about any single high score. Push for re-assessment and collect your own data; the field still needs it.