Table 4 Usability tasks tested with severity levels and use error ratings

Tracking:

Orientation

(4 tasks)

1. Locating patient file

High

P (2.0)

P (2.0)

P (2.0)

P (2.0)

2. Identifying a value for a specific physiological variable

High

P (1.8)

P (1.8)

P (1.5)

P (1.7)

3. Estimating duration of event by identifying two time points

High

H (1.4)

P (2.0)

P (2.0)

P (1.8)

4. Manipulating time scale

High

H (1.0)

F (0.4)

H (0.6)

H (0.6)

Function Use Error Rating by Clinician Type

P (1.5)

H (1.5)

P (1.5)

P (1.5)

Trajectory:

Relationships between Parameters (10 tasks)

5. Comparing trends for two specific parameters

High

H (1.4)

P (1.6)

P (1.5)

H (1.5)

6. Comparing different patient physiological states

High

H (1.3)

H (1.4)

H (1.2)

H (1.3)

7. Identifying values for two specific parameters at an event

High

H (1.4)

H (1.1)

H (0.6)

H (1.0)

8. Identifying vital signs (group of parameters) prior to an event

High

H (0.7)

F (0.4)

H (1.3)

H (0.8)

9. Viewing trend of three redundant overlapping parameters

High

H (1.3)

H (1.4)

H (0.7)

H (1.1)

10. Viewing infusion medication data

High

P (1.8)

H (1.3)

P (2.0)

P (1.7)

11. Comparing infusion medications with vital signs

High

P (1.9)

P (1.7)

P (1.6)

P (1.7)

12. Detecting change in infusion medication rate over time

High

H (1.4)

F (0.4)

H (0.5)

H (0.8)

13. Viewing ventilator data

High

P (2.0)

P (1.6)

P (1.6)

P (1.7)

14. Viewing laboratory data

High

H (1.0)

P (1.8)

P (1.7)

H (1.5)

Function Use Error Rating by Clinician Type

H (1.4)

H (1.3)

H (1.3)

H (1.3)

Triggering:

Automated Integration (3 tasks)

15. Viewing target ranges using shading (semi-automatic aid)

Moderate

F (0.4)

H (0.6)

F (0.4)

F (0.5)

16. Sparkline (automatic trend line for one variable)

Minor

F (0.4)

H (0.8)

F (0.0)

F (0.6)

17. IDO₂ indicator (automatic computation using 16 parameters)

High

F (0.4)

H (0.5)

F (0.3)

F (0.4)

Function Use Error Rating by Clinician Type

F (0.4)

H (0.6)

F (0.2)

F (0.4)

Other Functions

(3 tasks)

18. Finding notes

High

H (1.1)

P (1.9)

H (1.4)

H (1.5)

19. Modifying/adding note

Moderate

H (0.9)

H (1.3)

P (1.5)

H (1.2)

20. Setting targets

Moderate

P (1.9)

P (1.9)

P (2.0)

P (1.9)

Function Use Error Rating by Clinician Type

H (1.3)

P (1.7)

P (1.6)

P (1.5)

All functions

Global Function Use Error Rating, for All Functions by Clinician Type and for All Clinicians

H (1.3)

H (1.3)

H (1.2)

H (1.2)