Women’s Reproductive Health in Yemen By T.S. Sunil and Vijayan P ...

II. Factors affecting exposure to conception (conception variables).
7. Fecundity or infecundity, as affected by involuntary causes
8. Use or non-use of contraception
a.by mechanical and chemical means
b.by other means
9. Fecundity or infecundity, as affected by voluntary causes (sterilization, subincision, medical treatment, etc.)

III. Factors affecting gestation and successful parturition (gestation variables).
10. Foetal mortality from involuntary causes
11. Foetal mortality from voluntary causes. (p. 212)

Researchers have developed several theoretical developments since the introduction of the intermediate factors of