等级 | 观察组 | 对照组 |
支持 | 28 (93.33)* | 17 (56.67) |
A | 23 (76.67) | 13 (43.33) |
B | 5 (16.67) | 10 (33.33) |
C | 2 (6.67) | 7 (23.33) |
D | 0 | 0 |
秩均值 | 25.25* | 35.75 |