| factors | mean value ± standard deviation | F | P |
| grade |
|
|
|
| freshman | 4.41 ± 1.03 | 1.60* | 0.19 |
| sophomore | 4.75 ± 0.85 |
|
|
| Junior year | 4.78 ± 0.81 |
|
|
| Senior year | 4.64 ± 0.91 |
|
|