Table 4.

Health-ITUES and feature-specific usability scores

	Mean (SD)
Health-ITUES
Perceived usefulness	3.99 (0.66)
Perceived ease of use	3.80 (1.06)
User control	3.73 (0.89)
Overall score	3.84 (0.71)
Feature-specific
Pleasant to use	3.90 (0.57)
User satisfaction: automatically generated criteria parsing result	4.00 (0.67)
User satisfaction: modified criteria parsing result	4.10 (0.74)
User satisfaction: concept searching	3.60 (0.97)
User satisfaction: annotation dialog	4.20 (0.63)
Easy to learn: add a concept	4.50 (0.53)
Easy to learn: update a concept	4.70 (0.49)
Easy to learn: delete a concept	4.60 (0.52)
Easy to learn: delete all concepts in an eligibility criterion	4.60 (0.52)
Easy to learn: select eligibility criteria	4.30 (0.95)
Availability of all user engagement features	4.30 (0.95)