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Table 3 Mean and Standard Deviation of the severity scores of identified problems per method and usability attribute

From: A combination of two methods for evaluating the usability of a hospital information system

 Heuristic evaluation, Mean ± SDThink aloud,
Mean ± SD
Think aloud + Heuristic evaluation,
Mean ± SD
Both Think aloud and Heuristic evaluation,
Mean ± SD
Only Think aloud,
Mean ± SD
Only Heuristic evaluation,
Mean ± SD
Satisfaction3.17 ± 3.023.29 ± 0.363.22 ± 2.414.21 ± 4.833.29 ± 0.362.59 ± 0.65
Effectiveness3.47 ± 0.593.65 ± 0.413.53 ± 0.553.79 ± 0.323.65 ± 0.462.85 ± 0.49
Efficiency3.58 ± 0.663.31 ± 0.353.41 ± 0.53.96 ± 0.13.31 ± 0.352.92 ± 0.71
Learnability3.05 ± 0.663.23 ± 0.213.1 ± 0.573.53 ± 0.593.23 ± 0.212.86 ± 0.59
Error3 ± 0.673.22 ± 0.383.06 ± 0.613.55 ± 0.493.22 ± 0.382.67 ± 0.54
severity rating of
Total
3.25 ± 0.253.34 ± 0.173.26 ± 1.67