| 1st grade | 2nd grade | t | p | ||
M | SD | M | SD | |||
IM | 5.82 | 0.91 | 5.66 | 1.14 | 0.71 | >0.05 |
IR | 5.53 | 0.88 | 5.43 | 0.97 | 0.49 | >0.05 |
ER | 1.88 | 0.81 | 1.55 | 0.71 | 2.01 | <0.05 |
AM | 1.80 | 0.97 | 1.81 | 0.89 | −0.04 | >0.05 |