Table 3 The grade distributions of the student cases in the outbreak
Grade | Number | Cases | Attack rate (%) |
|---|---|---|---|
1 | 182 | 28 | 15.38 |
2 | 175 | 30 | 17.14 |
3 | 166 | 28 | 16.87 |
4 | 158 | 44 | 27.85 |
5 | 150 | 53 | 35.33 |
6 | 173 | 8 | 4.62 |
7 | 171 | 22 | 12.87 |
8 | 132 | 15 | 11.36 |
9 | 118 | 10 | 8.47 |
10 | 94 | 11 | 11.70 |
11 | 95 | 5 | 5.26 |
12 | 79 | 0 | 0.00 |
Total | 1693 | 254 | 15.00 |