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menarche
Onset of menstruation, average age is 12.3 years [1].
Notes:
- apparently mencarche does not preclude primary ovarian failure [2]
References
- Andersone SE & Must A
Intepreting the continued decline in the average age at menarche:
Results form two nationally representive surveys of US girls
studied 10 years apart.
J Pediatri 2005; 147:753
PMID: 16356426
- Biro FM
Secular trends in menarche.
J Pediatr 2005; 147:725
PMID: 16356410
- Medical Knowledge Self Assessment Program (MKSAP) 16,
American College of Physicians, Philadelphia 2012