Appendix.
Final TAM-CGM Scales and Items.
| Factor loadings (EFA) | |
|---|---|
| Perceived Reliability (Cronbach’s alpha = .88, explained variance = 65.5%) | |
| The device is very susceptible to interferences.a | .897 |
| CGM shows too many measurement errors.a | .825 |
| Overall, I think the system is reliable. | .794 |
| The device triggers false alarms too often.a | .710 |
| Information Overload (Cronbach’s alpha = .87, explained variance = 65.9%) | |
| Sometimes I do not know what to do with all the information provided by the CGM. | .884 |
| CGM provides too many readings. | .850 |
| It would be better if the CGM would provide less information. | .775 |
| CGM delivers too many information for me. | .728 |
| Technology-Related Self-Efficacy (Cronbach’s alpha = .84, explained variance = 64.88%) | |
| Generally, I think it is easy to learn how to use a new technology. | .854 |
| I feel me very confident in my abilities to make use of new technologies. | .782 |
| When I use a technological device, I do feel that I am in control. | .779 |
| Usefulness (Cronbach’s alpha = .85, explained variance = 56.2%) | |
| CGM makes it easier to keep blood glucose levels under control. | .889 |
| CGM improves diabetes self-management. | .787 |
| Ease of Use (Cronbach’s alpha = .86, explained variance = 67.6%) | |
| I think the system is ease to use. | .848 |
| I think it is difficult to adjust the system’s settings properly.a | .808 |
| Using the CGM is awkward.a | .811 |
| Attitude (Cronbach’s alpha = .85, explained variance = 68.6%) | |
| All in all, I can say: CGM to help with my diabetes disease is . . . | |
| Helpful. | .863 |
| Adversely.a | .863 |
| Visibility of Body Change (Cronbach’s alpha = .88, explained variance = 68.0%) | |
| CGM changes my body in a negative way. | .731 |
| CGM embarrasses me because I perceive myself as being different from the others. | .875 |
| I do not like to wear CGM because it arouses attention of other people. | .774 |
| The CGM embarrasses me, because I have to justify myself constantly. | .906 |
| Intentionb (Cronbach’s alpha = .92, explained variance = 86.1%) | |
| Assuming I continue having a CGM, I intend to use it. (current users). | .928 |
| Assuming I obtain a CGM again, I intend to use it. (former users). | |
| Assuming I obtain a CGM, I intend to use it. (patients without experience). | |
| Given that I continue having access to a CGM system, I predict that I will use it. (current users) | .928 |
| Given that I have access to a CGM system again, I predict that I would use it. (former users) | |
| Given that I have access to a CGM system, I predict that I would use it. (patients without experience) | |
Translated from German. aThe score of these items were inverted in the data analysis. bThese items have been presented separately depending on experience with CGM and grouped accordingly for data analysis.