Table 2.

Participants satisfaction with the device at the end of the 1-month follow-up.

Participants satisfaction	Participant ratingsa, mean (individual)
The device helps me to achieve my objectives (facilitating role)	3.7 (5, 3, 3)
It motivates me to complete my activities (facilitating role)	3.0 (1, 3, 5)
It helps me to be more efficient (facilitating role)	3.0 (5, 2, 2)
The device is easy to install (user friendliness)	2.7 (0, 5, 3)
The device is fun to use (user friendliness)	5.0 (5, 5, 5)
Using it is effortless (user friendliness)	5.3 (5, 5, 6)
I don’t need written instructions (user friendliness)	3.0 (1, 5, 3)
I easily learned to use it (user friendliness)	4.7 (5, 5, 4)
I quickly became an expert in its use (user friendliness)	4.7 (6, 4, 4)
It is easy to use (user friendliness)	4.0 (4, 4, 4)
It is user-friendly (user friendliness)	4.7 (5, 4, 5)
It is suitable for both frequent and infrequent users (user friendliness)	5.0 (5, 5, 5)
I always remember how to use it (user friendliness)	3.7 (6, 2, 3)
It is pleasant to use (user friendliness)	3.3 (5, 2, 3)
I am always able to use the device (reliability)	2.3 (1, 4, 2)
It always works as desired (reliability)	2.7 (3, 1, 4)
It always does exactly what I want (reliability)	1.3 (0, 2, 2)
It perfectly fits my needs	2.0 (1, 0, 5)
I need to have one	2.7 (1, 4, 3)
I will recommend it to a friend	3.0 (1, 3, 5)

^aAnswers range from 0 to 6: 0=strongly disagree, 1=disagree, 2=somewhat disagree, 3=no opinion, 4=somewhat agree, 5=agree, 6=strongly agree. The higher the rating, the better the satisfaction.