This study examines the relationship of finger ridge-counts to second to fourth digit ratio, which has not yet been definitively demonstrated. The related question of sex dimorphism in finger ridge-counts is further elucidated.

中文翻译：

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指脊数与第二指到第四指的比例相关（2d:4d）

这项研究检查了手指脊数与二至四指比例的关系，这尚未得到明确证明。进一步阐明了手指脊数中性别二态性的相关问题。