Rasch calibration of physical activity self-efficacy and social support scale for persons with intellectual disabilities.

Lee et al. (2010) tested two short surveys with adults who have intellectual disabilities. One survey asked, "Can you do physical activities?" The other asked, "Do people support you to move more?"

The team used Rasch modeling. This method checks if each question fits one clear idea. It also spots items that confuse people with different disability levels.

Both surveys passed the Rasch test. All items lined up on a single ruler: self-efficacy and social support. No question gave an unfair edge to people with mild or severe ID.

In plain words, the six-item confidence scale and the 17-item support scale are ready for real-world use.

Davis et al. (2009) warned that the popular Rosenberg Self-Esteem Scale works poorly with adults who have ID. Miyoung’s positive result shows not all self-report tools fail; careful Rasch work can yield clean data.

Amore et al. (2011) also used Rasch to shorten a technology-use questionnaire for the same population. Both studies prove Rasch is a trusted friend when you need brief, fair scales.

Mumbardó-Helles et al. (2017) meta-analysis found gender, race, and label shift self-determination scores. Miyoung’s scales showed no such bias, giving you steadier baseline data for physical-activity plans.

You now have two free, validated scales that take under five minutes to give. Use them during intake to see why a client avoids the gym or park. Match low scores with extra staff prompts, peer buddies, or simpler tasks. Track the numbers monthly to prove your physical-activity program is working.