Distribution of average responses with 95% CI to the six questions on user satisfaction and four technological feasibility questions at week 1 and week 12 and the difference between week 12 and week 1 (N=11)
| Weekly follow-up questions (utility and usability) | Week 1 Value (95% CI) | Week 12 Value (95% CI) | Difference Value (95% CI) | Difference % (95% CI) |
| Technical feasibility (usability) | ||||
| VETT on mobile phone is simple and intuitive to use. | 64 (48 to 79) | 79 (71 to 86) | 15 | 23 |
| Reminders of tasks arrive at the agreed upon time. | 68 (49 to 87) | 73 (54 to 91) | 5 | 7 |
| It is easy and intuitive to answer the reminders. | 51 (35 to 67) | 83 (77 to 90) | 32 | 63 |
| It is easy and intuitive to answer that the task is done. | 61 (41 to 80) | 83 (77 to 90) | 22 | 36 |
| Average usability (CI) | 61 (54 to 68) | 80 (75 to 84) | 19 (7 to 30)* | 32 (9 to 55) |
| User satisfaction (utility) | ||||
| VETT on mobile phone motivates me. | 65 (59 to 83) | 73 (64 to 83) | 8 | 12 |
| The established goal was right for me. | 80 (71 to 89) | 86 (80 to 91) | 6 | 8 |
| The tasks are correctly selected. | 73 (64 to 82) | 85 (76 to 94) | 12 | 16 |
| The reminders are right for me. | 69 (53 to 85) | 83 (75 to 90) | 14 | 20 |
| The weekly feedback reminder is useful. | 67 (49 to 86) | 83 (74 to 91) | 16 | 24 |
| The weekly summary is perceived as useful. | 74 (57 to 91) | 74 (58 to 90) | 0 | 0 |
| Average utility (CI) | 71 (67 to 76) | 81 (76 to 85) | 9 (5 to 14) | 13 (6 to 20) |
All values are estimated on a scale of 0–100 (0=total disagreement, 100=total agreement).
*P=0.04.