| Student background | N | Mean | t-test | p value |
| Gender |
|
|
|
|
| Male | 120 | 0.88 (SD 0.12) | −2.359 | 0.019 |
| Female | 112 | 0.92 (SD 0.09) |
|
|
| Age |
|
|
|
|
| 5 years old | 113 | 0.52 (SD 0.11) | −2.377 | 0.018 |
| 6 years old | 119 | 0.74 (SD 0.12) |
|
|