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Table 1 Sample characteristics by study stage, completion time and system usability scale (SUS) of myfood24

From: Formative evaluation of the usability and acceptability of myfood24 among adolescents: a UK online dietary assessments tool

General characteristics

Stage-I (n.14) Beta-version of myfood24

Stage-II (n.70) Live version of myfood24

Age (mean, SD)

15.6 (2)

14.6 (2)

Gender (girls)

8 (57 %)

35 (50 %)

Ethnicity (white)

12 (86 %)

61 (87 %)

    (other)

2 (14 %)

9 (13 %)

Confident in using technologyb

  

    (10/10)

5 (36 %)

26 (37 %)

    (9/10)

7 (50 %)

20 (29 %)

    (8/10)

2 (14 %)

19 (27 %)

Access the internet (daily)

12 (86 %)

59 (84 %)

Access the internet at home

14 (100 %)

69 (99 %)

Completion time (mean, SD)

31.4 (9)

16.2 (4)

SUSa (mean, 95 % CI)

66 (60, 73)

74 (71, 77)

  1. aSUS system usability score [36]
  2. bfive participants did not answer the question