| Gender | N | The proportion of each grade | ||||
| Excellent | Middling above | Middling | Middling below | Poor | ||
| Male | 159 | 5.03 | 19.50 | 40.88 | 33.96 | 7.55 |
| Female | 170 | 7.65 | 27.06 | 35.29 | 17.06 | 6.47 |
| Difference value | — | −2.62 | −7.56 | 5.59 | 16.90 | 1.08 |