防护等级 | 人数 | DRPI | MASD | ST | 合计 |
一级 | 505 | 39 (7.72) | 54 (10.69) | 2 (0.4) | 95 (18.81) |
二级 | 220 | 86 (39.09) | 63 (28.63) | 5 (2.27) | 154 (70.00) |
三级 | 91 | 37 (40.66) | 28 (30.77) | 7 (7.69) | 72 (79.12) |
X2 | — | 122.630 | 45.611 | 24.897 | 236.190 |
P | — | <0.001 | <0.001 | <0.001 | <0.001 |