结果：肱二头肌键膜与正中神经的关系：非覆盖型80%(40侧)，部分覆盖型12%(6侧)和全覆盖型4侧(8%)。

Results: The relationship between bicipital aponeurosis and median nerve: 80% non-covered type (40), 12% partially covered (6) and 8% completely covered type (4).

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目的解决校正中心效应的非劣性检验的问题。

Objective To solve the problem of non-inferiority test by adjusting central effect in multicenter trials.

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