Assertion: primary amenorrhoea | /r/HasProperty | the absence of menstruation
Facets:
value: by primary
type: OTHER
value: by the age of 16
type: TEMPORAL
Source sentences:
text: By primary vs. secondary: Primary amenorrhoea is the absence of menstruation in a woman by the age of 16.  
text: By primary vs. secondary: Primary amenorrhoea is the absence of menstruation in a woman by the age of 16.