In keeping with these hormonal differences, the digit ratios are sexually dimorphic, being lower in men than in women. In palmar digit ratios, strong sexual dimorphism occurs in those of digit 2. In dorsal digit ratios, in contrast, strong sexual dimorphism occurs in those of digit 5, with women having shorter fifth digits on average. Overall, the report of sexual dimorphism is much stronger in dorsal digit ratios than in palmar digit ratios, especially as compared to the classic, palmar 2D:4D ratio. Moreover, compared to palmar digit ratio, dorsal digit ratio is a better indicator of bone digit ratio. Thus, while most of the earlier research has focused on palmar 2D:4D ratio, study of other digit ratios is also promising.