Contraceptive Effectiveness Rates
|
Contraceptive
|
Theoretical
|
Actual
|
| Norplant |
99.9%
|
99.9%
|
| Depo-Provera |
99.9
|
99.9
|
| Birth control Pill (combination pill) |
99.5-99.9
|
97-98
|
| Condom & Spermicide |
99
|
95
|
| I.U.D |
98-99
|
94-95
|
| Condom Alone |
98
|
88-90
|
| Diaphragm & Spermicide |
95-98
|
81-82
|
| Cervical Cap & Spermicide |
95-98
|
82-87
|
|
Spermicide Alone: Foams, Creams, Jellies, Vaginal Suppositories, Film |
95-97
|
79-82
|
| Fertility Awareness |
80-98
|
76-80
|
| Nothing |
10-11
|
10-11
|
Abstinence remains the only means to guarantee freedom from pregnancy and STDs.
*Effectiveness rate = number of sexually active fertile women, of 100, who do not get pregnant over a one year period using the reporting method.
Adapted from Contraception Choice
University Health Services
University of Massachusetts Amherst
1995