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This study concluded that the digit-length ratio (2D:4D) does not predict androgenic alopecia development, suggesting prenatal androgen exposure does not predispose men to this condition.

In this review, the authors evaluated the potential of using the second to fourth digit ratio (2D:4D) as a predictor for androgenetic alopecia, suggesting future research directions but not reporting definitive results.

This study reports that a lower 2D:4D finger length ratio is significantly associated with higher disease activity and reduced spinal mobility in females with ankylosing spondylitis, but not in males.

This research suggests that the digit ratio, 2D:4D, is unlikely to be a significant indicator of male androgenetic alopecia, contradicting a prominent isolated finding from a previous study.

In this study, researchers found that the congenital absence of the palmaris longus muscle was relatively uncommon and showed no significant differences according to sex, side, or digit ratio (2D:4D) among individuals assessed using MRI and radiographs.