Comparison of usability evaluation methods for a health information system: heuristic evaluation versus cognitive walkthrough method

Table 4 Number and severity of the recognized problems by the two evaluation methods

Methods	Number of problems		Number of unique problems based on severity				Mean ± SD	Mann–Whitney test
Methods	Total	Unique	Cosmetic N (%)	Minor N (%)	Major N (%)	Catastrophic N (%)	Mean ± SD	Mann–Whitney test
HE	317	104	8 (7.7)	57 (54.8)	33 (31.7)	6 (5.8)	2.34 ± 0.65	Z = –3.082 P = 0.002
CW	46	24	–	10 (41.7)	12 (50)	2 (8.3)	2.77 ± 0.51	Z = –3.082 P = 0.002

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