primary & secondary dysmenorrhea from history

Dr Shaiful Ehsan: Homework for u guys:
How do u differentiate between primary & secondary dysmenorrhea from history?
Tq.

 Wana: Primary dysmenorrhea:
-Onset shortly after menarche (≤6 months)
-Usual duration of 48-72 hours (often starting several hours before or just after the menstrual flow)
-Cramping or laborlike pain
-Background of constant lower abdominal pain, radiating to the back or thigh

 secondary dysmenorrhea:
-Dysmenorrhea beginning in the 20s or 30s, after previous relatively painless cycles
-Heavy menstrual flow or irregular bleeding
-Dysmenorrhea occurring during the first or second cycles after menarche
-Infertility
- deep dyspareunia
-Vaginal discharge