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Table 1 Usability attributes of eCODES by age group

From: Development and usability testing of a Web-based decision aid for families of patients receiving prolonged mechanical ventilation

  ≤45 n = 12 46 to 55 n = 7 56 to 65 n = 6 ≥66 n = 5 Total n = 30
Selected Systems Usability Scale total scores
Mean (SD) 84 (9) 85 (11) 75 (7) 68 (8) 80 (10)
Median (IQR) 83 (80, 88) 95 (80, 95) 74 (70, 78) 68 (60, 75) 80 (73, 88)
Range 70 to 95 68 to 95 70 to 88 60 to 75 55 to 95
Systems Usability Scale items*
I think that I would like to use this program if I had a loved one in the ICU 11 (92%) 7 (100%) 5 (83%) 5 (100%) 28 (93%)
I thought the program was too complex 0 (0%) 0 (0%) 0 (0%) 0 (0%) 0 (0%)
I thought the program was easy to use 11 (92%) 7 (100%) 5 (83%) 4 (80%) 27 (90%)
I think that I would need the support of a technical person to be able to use the program. 0 (0%) 0 (0%) 0 (0%) 1 (20%) 1 (3%)
I found the information and questions in the program were well integrated 10 (%) 7 (100%) 6 (100%) 5 (100%) 28 (93%)
I thought there was too much inconsistency in the program. 0 (0%) 0 (0%) 0 (0%) 1 (20%) 1 (3%)
I would imagine that most people would learn to use this program very quickly 12 (100%) 7 (100%) 6 (100%) 5 (100%) 29 (97%)
I found the program very cumbersome to use. 0 (0%) 0 (0%) 0 (0%) 0 (0%) 0 (0%)
I felt very confident using the program 11 (92%) 7 (100%) 6 (100%) 4 (80%) 28 (93%)
I needed to learn a lot of things before I could get going with this program. 0 (0%) 0 (0%) 0 (0%) 0 (0%) 0 (0%)
I was able to:**
Answer the questions in the program 12 (100%) 7 (100%) 6 (100%) 4 (80%) 29 (97%)
Complete the computer program 12 (100%) 7 (100%) 6 (100%) 5 (100%) 30 (100%)
I was satisfied with:***
The computer program overall 12 (100%) 7 (100%) 5 (83%) 4 (80%) 28 (93%)
How easy it was to use the program 12 (100%) 7 (100%) 6 (100%) 4 (80%) 29 (97%)
The layout of the program 11 (92%) 7 (100%) 6 (100%) 4 (80%) 29 (97%)
The instructions 12 (100%) 7 (100%) 6 (100%) 4 (80%) 29 (97%)
Prefer eCODES to printed version of decision aid 11 (92%) 7 (100%) 6 (100%) 4 (80%) 29 (97%)
  1. *n (%) who reported ‘strongly agree’ or ‘agree’. **n (%) who were able to perform the task. ***n (%) who were ‘very satisfied’ or ‘satisfied’.