| Grade | The number of times a week students eat breakfast | F | ||||
| Three times or less | Four times | Five times | Six times | Seven times | ||
| Five | 47.29 ± 13.66 | 48.06 ± 13.77 | 52.00 ± 13.98 | 57.08 ± 14.52 | 58.86 ± 13.42 | 190.95*** |
| Eight | 55.83 ± 14.51 | 57.04 ± 14.71 | 58.29 ± 13.99 | 63.34 ± 13.74 | 61.84 ± 13.90 | 56.77*** |