tokens: Using as the reference group women who were not using oral contraception , had no recent pregnancy or menopausal symptoms , the case - control analysis gave an adjusted odds ratio ( OR ( adj ) ) of 7 . 44 ( 95 % CI 3 . 67 - 15 . 08 ) for CPA / EE use compared with an OR ( adj ) of 2 . 58 ( 95 % CI 1 . 60 - 4 . 18 ) for use of conventional COCs .