2D:4D indicates phimosis risk: A study on digit ratio and early foreskin development

Area of Science:

• Pediatric endocrinology
• Urology
• Developmental biology

Background:

• The second to fourth finger length ratio (2D:4D) is utilized as a biomarker for prenatal androgen exposure.
• 2D:4D ratio is associated with various traits, including behavioral phenotypes, disease susceptibility, and urogenital system development.

Purpose of the Study:

• To investigate the correlation between the 2D:4D ratio and the development of the foreskin in early childhood.

Main Methods:

• The study analyzed 176 boys aged 0-6 years, measuring their 2D:4D ratio (left and right hands) and classifying foreskin status into four types: phimosis, partial phimosis, adhesion, and normal.
• Participants were grouped by age: neonates (0-28 days), infants (1-12 months), toddlers (1-2 years), and preschool children (3-6 years).

Main Results:

• Phimosis rates decreased with age, from 92.3% in neonates to 38.7% in preschool children.
• The incidence of normal foreskin increased from 0% in neonates to 13.2% in preschool children.
• A higher right-hand 2D:4D ratio correlated with a downward trend in foreskin development, while increasing age correlated with a higher rate of normal foreskin cases.

Conclusions:

• A higher R2D:4D ratio is identified as a potential risk factor for phimosis in early development.
• Age significantly influences foreskin condition, with improved development observed in older children.
• Further research is needed to elucidate the pathophysiological mechanisms and clinical implications of these findings.