Table 2.
Postparticipation questionnaire summary (n=35).
| Questionnaire itemsa | Values, n (%) | |
| Participant was able to accurately tell Alexa what they ate and drank (n=35) | ||
|
|
Completely agree | 3 (9) |
|
|
Somewhat agree | 16 (46) |
|
|
Neither agree not disagree | 2 (6) |
|
|
Somewhat disagree | 12 (34) |
|
|
Completely disagree | 2 (6) |
| Participant was able to estimate accurate quantities describing how much they ate (n=34) | ||
|
|
Completely agree | 3 (9) |
|
|
Somewhat agree | 11 (32) |
|
|
Neither agree not disagree | 10 (29) |
|
|
Somewhat disagree | 9 (26) |
|
|
Completely disagree | 1 (3) |
| Participant chose not to record particular snacks or meals (eg, because it was unhealthy; n=35) | ||
|
|
Completely agree | 1 (3) |
|
|
Somewhat agree | 5 (14) |
|
|
Neither agree not disagree | 0 (0) |
|
|
Somewhat disagree | 7 (20) |
|
|
Completely disagree | 22 (63) |
| Participant sometimes chose to be selective with the truth (n=35) | ||
|
|
Completely agree | 3 (9) |
|
|
Somewhat agree | 5 (14) |
|
|
Neither agree not disagree | 3 (9) |
|
|
Somewhat disagree | 6 (17) |
|
|
Completely disagree | 18 (51) |
| Participant felt they remembered to submit food and drink information (n=35) | ||
|
|
Completely agree | 9 (26) |
|
|
Somewhat agree | 19 (54) |
|
|
Neither agree not disagree | 1 (3) |
|
|
Somewhat disagree | 6 (17) |
|
|
Completely disagree | 0 (0) |
| Alexa interjected when I had not finished telling her when I ate or drank (n=35) | ||
|
|
Never | 4 (11) |
|
|
Rarely | 13 (37) |
|
|
Occasionally | 11 (31) |
|
|
Often | 6 (17) |
|
|
Always | 1 (3) |
| Alexa interjected when I had not finished telling her what I ate or drank (n=35) | ||
|
|
Never | 2 (6) |
|
|
Rarely | 3 (9) |
|
|
Occasionally | 12 (34) |
|
|
Often | 17 (49) |
|
|
Always | 1 (3) |
| How convenient or inconvenient did you find providing information using Alexa? (n=35) | ||
|
|
Very inconvenient | 4 (11) |
|
|
Somewhat inconvenient | 13 (37) |
|
|
OK | 10 (29) |
|
|
Somewhat convenient | 7 (20) |
|
|
Very convenient | 1 (3) |
| How enjoyable or unenjoyable did you find providing information using Alexa? (n=35) | ||
|
|
Very unenjoyable | 3 (9) |
|
|
Somewhat unenjoyable | 11 (31) |
|
|
OK | 15 (43) |
|
|
Somewhat enjoyable | 6 (17) |
|
|
Very enjoyable | 0 (0) |
| How efficient or inefficient did you find providing information using Alexa? (n=35) | ||
|
|
Very inefficient | 5 (14) |
|
|
Somewhat inefficient | 15 (43) |
|
|
OK | 6 (17) |
|
|
Somewhat efficient | 8 (23) |
|
|
Very efficient | 1 (3) |
| How easy or hard did you find providing information using Alexa? (n=35) | ||
|
|
Could not use at all | 0 (0) |
|
|
Very hard | 3 (9) |
|
|
Somewhat hard | 18 (51) |
|
|
OK | 7 (10) |
|
|
Somewhat easy | 7 (20) |
|
|
Very easy | 0 (0) |
| Happy to use a voice-controlled system (eg, Alexa) at home for research in the future (n=35) | ||
|
|
Yes | 26 (74) |
|
|
No | 2 (6) |
|
|
Not sure | 7 (20) |
| Happy to use a voice-controlled system (eg, Alexa) on a wearable device such as a smart watch, for research (n=35) | ||
|
|
Yes | 28 (80) |
|
|
No | 1 (3) |
|
|
Not sure | 6 (17) |
aA summary of all items in the postparticipation questionnaire is provided in Table S3 in Multimedia Appendix 1.