Objectives: To compare the usability of a new certolizumab pegol (CZP) autoinjector with the adalimumab, etanercept, and golimumab devices in patients with rheumatoid arthritis.
Methods: Two identical studies were performed in 2013 and 2016; patients performed a simulated self-injection with the CZP autoinjector and the most up-to-date device versions at the time in a randomized, consecutive sequence. The primary end point was the ranking of the four autoinjectors in order of preference. Device usability and intuitiveness were assessed across a range of secondary and exploratory end points.
Results: The 2013 and 2016 study populations included 76 patients each; a significant majority (2013: 67%; 2016: 59%) ranked the CZP autoinjector as their most preferred device (p < 0.001). Most patients agreed that the CZP autoinjector was easier to use, start, and manipulate, and were more willing to use it than the comparator devices (p < 0.001 for all pairwise comparisons with CZP). Likert score differences also favored the CZP autoinjector regarding how easy it was to determine injection completion. The CZP autoinjector was associated with a low rate of use error.
Conclusions: In both studies, the CZP autoinjector was the preferred choice compared to the alternative devices and was associated with a high level of patient satisfaction.
Keywords: Autoinjector; certolizumab pegol; patient preference; rheumatoid arthritis; usability.