Group | n | 0 w | 2 w | 4 w | 6 w |
HFZS | 35 | 7.44 ± 0.27 | 6.65 ± 0.41 | 6.38 ± 0.26 | 6.98 ± 0.20 |
HF | 32 | 7.42 ± 0.33 | 6.59 ± 0.36 | 6.55 ± 0.37 | 6.63 ± 0.27** |
ZS | 31 | 7.39 ± 0.31 | 6.71 ± 0.31 | 6.67 ± 0.33△△ | 6.52 ± 0.23△△ |