OBJECTIVES: To maintain measurement equivalence when presenting Patient-Reported Outcomes Measures (PROMs) on a multitude of devices (i.e. BYOD) requires adherence to implementation standards as defined in the eCOA Consortium guidelines. Contrary to these, inclusivity demands use of accessibility features like Zooming which individualizes presentation of PROMs and individual scales and the participant experience. This project assessed the potential effect on the measurement equivalence between both approaches.

METHODS: We conducted an equivalence study with 55 participants suffering from acute or chronic pain and included vision-impaired volunteers. All participants were randomized into two groups and answered a standard questionnaire with standard scale implementation as defined in the eCOA consortium white-papers and a new implementation that supported a Zoom-In accessibility feature. Between both sessions the participants conducted a distraction task.

RESULTS: We found excellent equivalence between both implementations with an overall Domain Score ICC of 0.966 and individual domain score ICCs ranging from 0.805 to 0.961.

CONCLUSIONS: With some careful consideration for scale implementation supporting accessibility features like Zooming it is possible to bridge the gap between standard and individualized presentation of PROMs without a negative effect on the measurement equivalence. These results encourage the mindful use of accessibility features to provide greater inclusivity and enhanced usability for more participants, including those with vision impairments.