Group | Number | 6 h | 18 h |
Control group | 57 | 73.23 ± 3.82 | 74.44 ± 4.46 |
Observation group | 58 | 80.60 ± 3.06 | 80.81 ± 4.35 |
t |
| 11.424 | 7.752 |
P |
| <0.01 | <0.01 |