Sample size | Total(°) | Left(°) | Right(°) | t valuea | P valuea | |
---|---|---|---|---|---|---|
Current study | 25 | 42.30 ± 4.48 | 41.92 ± 5.10 | 42.68 ± 3.98 | − | − |
Yamada etc. [19] | 40 | − | 32.80 ± 7.60 | 32.40 ± 7.10 | left: − 5.29;right: − 6.61 | < 0.001 |
Zhu etc. [20] | 30 | − | 35.72 ± 3.79 | 36.27 ± 3.27 | left: − 5.17;right: − 6.56 | < 0.001 |
Yuan etc. [21] | 25 | 36.69 ± 3.21 | − | − | 5.09 | < 0.001 |
Wang etc. [22] | 30 | 39.25 ± 2.64 | − | − | 3.46 | < 0.001 |