Variables | Model 1 | Model 2 | Model 3 | Model 4 | VIF |
Beta, t | Beta, t | Beta, t | Beta, t | VIF | |
Age | 0.108, 1.807 | 0.094, 1.592 | 0.039, 0.869 | 0.041, 0.946 | 1.108 |
Gender | 0.211***, 3.522 | 0.222***, 3.744 | 0.096*, 2.124 | 0.056, 1.258 | 1.184 |
Field of study | −0.101, −1.752 | −0.098, −1.729 | −0.030, −0.700 | −0.030, −0.718 | 1.021 |
Subjective norms | 0.173**, 3.020 | 0.047, 1.088 | 0.023, 0.559 | 1.063 | |
Personal attitude | 0.660***, 14.777 | 0.556***, 11.528 | 1.403 | ||
Perceived behavioural control | 0.231***, 4.778 | 1.413 | |||
R | 0.291 | 0.338 | 0.710 | 0.737 | |
R square | 0.085 | 0.114 | 0.505 | 0.543 | |
R square change | 0.085 | 0.030 | 0.39 | 0.038 | |
Adjusted R square | 0.075 | 0.102 | 0.496 | 0.533 | |
F-statistic | 8.611*** | 8.976*** | 56.469*** | 54.570*** | |
***sig. < 0.001(0.1 percent) | **sig. < 0.01(1 percent) *sig. < 0.05(5 percent) | VIF = Variance inflation Factor |