Table 4.
Adjusted associations between psychological needs and app usability.a
| Psychological needs (coefficients) | Satisfaction (SUSb) | Efficiency (minutes) | Success (%) | Accuracy (%) | |
| Competence | Model 1A | Model 2A | Model 3A | Model 4A | |
|
|
Adjusted effect | 3.1c | 0.2 | −0.1 | −2.9 |
|
|
Adjustedd R2 | .16 | .35 | .31 | .18 |
| Autonomy | Model 1B | Model 2B | Model 3B | Model 4B | |
|
|
Adjusted effect | 5.9e | −0.8 | 4.9c | 1.2 |
|
|
Adjustedd R2 | .17 | .37 | .33 | .17 |
| Connectivity | Model 1C | Model 2C | Model 3C | Model 4C | |
|
|
Adjusted effect | 2.5c | 0.2 | −0.02 | −0.01 |
|
|
Adjustedd R2 | .16 | .35 | .31 | .17 |
aN=184 observations from randomized 92 patients, adjusted all models with 15 covariates listed in model 1 from Table 3, which included age, sex, education, use of Samsung, mobile phone comfort, diabetes types, diabetes duration, insulin duration, hemoglobin A1c, blood glucose testing per day, blood glucose testing prescribed per day, motivation, testing order, app group, and interaction term between order and app.
bSUS: System Usability Scale.
cP<.05.
dObtained from linear regression model analysis without repeated measures.
eP<.01.