Psychometric evaluation of a questionnaire to measure the quality of life of people with profound multiple disabilities (QOL-PMD).

Petry et al. (2009) built a new tool called QOL-PMD. It asks caregivers how they see quality of life for people with profound multiple disabilities.

The team ran early psychometric checks. They looked at internal consistency and construct validity.

The first numbers look good. The scale hangs together and measures what it claims.

Still, the authors say more validation work is needed before you bank on the scores.

Schmidt et al. (2010) and Spriggs et al. (2015) also use proxy QoL scales for adults with ID. Both found staff or parents rate life lower than clients do. Katja’s tool focuses on the most disabled group, so watch for the same under-rating risk.

Kaplan-Kahn et al. (2026) tried PROMIS caregiver scales with minimally verbal autistic children. Many items did not apply, a warning that even good tools can misfit if the population is too severe. QOL-PMD was written for that severe end, giving you items that should fit better.

Nadwodny et al. (2026) tracked change with the QI-Disability scale and saw only tiny gains. The message: once you pick a proxy QoL tool, keep expectations modest; real-world change is hard to capture.

If you serve clients who can’t speak and have multiple disabilities, you need a way to show stakeholders how life looks from the client’s side. QOL-PMD gives you caregiver-rated items built for that exact group. Use it at intake, re-assess yearly, and compare medical or staffing changes to see if life quality moves. Just remember: proxy scores often run low, so pair them with direct observation and always hunt for unmet needs before you blame the person’s condition.