Fig. 4

Variation of use error ratings across clinician disciplines for all tasks related to tracking, trajectory, and triggering as well as other software functions. Three levels of use error ratings (UERs) were employed by two raters and averaged for each type of clinician for 20 tasks. The UER distribution was further grouped by function: tracking (Tasks 1–4), trajectory (Tasks 5–14), triggering (Tasks 15–17), and other (Tasks 18–20). Usability issues, defined as tasks with a UER of 1 or less and highlighted in yellow or red, were dependent on the type of task and, to a lesser extent, on the type of clinician. Most usability issues were centered on the trajectory and triggering functions. UER: Pass (P) = 2 (green), Help (H) = 1 (yellow) and Fail (F) = 0 (pink). Clinician groups: DR: physician intensivists, RN: intensive care nurses, and RT: respiratory therapists