Table 2.
Usability and acceptability of the chatbot and Fitbit.
|
|
Value | |
| System Usability Scale score for the chatbot (n=113), n (%) | ||
|
|
Good | 12 (10.6) |
|
|
OK | 89 (78.8) |
|
|
Poor | 12 (10.6) |
| Would recommend chatbot to others (n=113), n (%) | ||
|
|
Strongly agree or agree | 49 (43.4) |
|
|
Neutral | 36 (31.9) |
|
|
Strongly disagree or disagree | 28 (24.7) |
| Would continue to use the chatbot in future (n=113), n (%) | ||
|
|
Strongly agree or agree | 40 (35.4) |
|
|
Neutral | 32 (28.3) |
|
|
Strongly disagree or disagree | 41 (36.3) |
| The chatbot helped me to be more active (n=113), n (%) | ||
|
|
Strongly agree or agree | 60 (53.1) |
|
|
Neutral | 27 (23.9) |
|
|
Strongly disagree or disagree | 26 (23) |
| Usefulness—the chatbot helps me to increase confidence for physical activity participation (n=113), n (%) | ||
|
|
Not at all useful or a little useful | 52 (46) |
|
|
Somewhat useful | 27 (23.9) |
|
|
Quite useful or very useful | 34 (30.1) |
| Usefulness—the chatbot helps me to overcome barriers to physical activity participation (n=113), n (%) | ||
|
|
Not at all useful or a little useful | 60 (53.1) |
|
|
Somewhat useful | 24 (21.2) |
|
|
Quite useful or very useful | 29 (25.7) |
| Usefulness—the chatbot increased support for being active (n=113), n (%) | ||
|
|
Not at all useful or a little useful | 59 (52.2) |
|
|
Somewhat useful | 26 (23) |
|
|
Quite useful or very useful | 28 (24.8) |
| Usefulness—the chatbot helped me plan to be active (n=113), n (%) | ||
|
|
Not at all useful or a little useful | 63 (55.7) |
|
|
Somewhat useful | 20 (17.7) |
|
|
Quite useful or very useful | 30 (26.6) |
| Usefulness—the chatbot helped me to stay motivated (n=113), n (%) | ||
|
|
Not at all useful or a little useful | 47 (41.6) |
|
|
Somewhat useful | 26 (23) |
|
|
Quite useful or very useful | 40 (35.4) |
| Read the chatbot messages (n=113), n (%) | ||
|
|
Always | 71 (62.8) |
|
|
Most of the time | 35 (31) |
|
|
Sometimes or rarely | 7 (6.2) |
| Frequency of sending messages to chatbot (n=77), n (%) | ||
|
|
Several times a day | 30 (26.6) |
|
|
Once a day | 28 (24.8) |
|
|
Less than once a day | 19 (48.6) |
| Average messages/week sent to the chatbot (n=113), mean (SD) | 6.7 (7.0) | |
| Average time/day spent with the chatbot (minutes; n=113), mean (SD) | 5.1 (7.4) | |
| Liked the chatbot messages (n=113), n (%) | ||
|
|
Very much | 26 (23) |
|
|
Average | 42 (37.2) |
|
|
A little or not at all | 45 (39.8) |
| Understood the chatbot messages (n=113), n (%) | ||
|
|
Always or most of the time | 49 (43.3) |
|
|
Sometimes | 34 (30.1) |
|
|
Rarely or never | 30 (26.5) |
| Technical issues during the study (n=113), n (%) | ||
|
|
Yes | 93 (82.3) |
|
|
No | 20 (17.7) |
| Chatbot stopped sending motivational messages or updates at any time (n=113), n (%) | ||
|
|
Yes | 95 (84.1) |
|
|
No | 18 (15.9) |
| System Usability Scale for Fitbit Flex 1 (n=112), n (%) | ||
|
|
Good | 22 (19.6) |
|
|
OK | 77 (68.8) |
|
|
Poor | 13 (11.6) |
| Average weeks of wearing the Fitbit (n=112), mean (SD) | 5.4 (1.1) | |
| Average day/week of wearing the Fitbit (n=112), mean (SD) | 6.7 (0.9) | |
| Average h/day of wearing the Fitbit (n=112), mean (SD) | 19.5 (5.5) | |
| Frequency of using the Fitbit app (n=112), n (%) | ||
|
|
<1/day | 19 (17) |
|
|
Once a day | 27 (24.1) |
|
|
At least twice a day | 66 (58.9) |