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Table 1 Usability analysis: efficiency

From: Evaluating security and usability of profile based challenge questions authentication in online examinations

Question themes Completion time (seconds) Answer length (characters)
Academic questions Mean SD Mean SD
Find out about this course 14.14 7.98 7.0 6.11
Student number 14.55 8.52 3.0 2.9
Name of last school attended 14.60 6.67 14.86 9.38
Grades in highest qualification 15.14 6.29 2.0 2.47
Year of highest qualification 15.20 7.16 4.0 0
Month started the current course 15.61 8.06 5.0 2.03
Year started the current course 16.18 8.98 4.29 1.07
Highest qualification 16.93 6.80 9.40 8.47
Personal questions
Father’s surname 13.55 8.76 4.71 1.26
Country of birth 13.78 7.25 7.20 1.37
Best friend’s surname 14.47 6.95 5.79 2.57
Dream job as a child 18.03 8.65 9.85 5.24
Favourite questions
Hero of your childhood 14.70 5.94 11.71 5.31
Tutor 15.06 8.13 8 3.48
Module on this course 18.34 9.8 7.5 5
Contact questions
Home Tel no with country code 15.73 8.78 10.60 3
Home address town 16.83 9.36 15 13.75
House name or number 17.18 7.8 19.58 18.55
Mobile number with country code 17.43 8.98 11.69 1.43
Date questions
Date of birth 16.42 6.75 6.36 3.91