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Factors to Consider Regarding the Effectiveness of Contraception


Updated July 02, 2014

Factors to Consider Regarding the Effectiveness of Contraception

Effectiveness of Contraception

Photo © 2011 Dawn Stacey
When deciding on a contraceptive method, certain birth control considerations may come into play. The effectiveness of contraception may or may not be an important consideration. However, the reliability of any contraceptive method depends on whether it's used consistently and correctly. That being said, the failure rates of some methods are significantly higher than others. You need to decide what level of effectiveness is most acceptable to you.

There are also actions that you can either start doing or stop yourself from doing that can actually have an affect on your birth control method:

Typical Use versus Perfect Use:

To understand how to determine the effectiveness of contraception, it is important to know that effectiveness rates often provided as typical user rates and perfect use rates.

  • Typical use refers to failure rates for people who do not consistently or always correctly use their birth control. These rates usually apply to the average person as it is sometimes difficult to always and reliably use birth control correctly

  • Perfect use refers to failure rates for those whose use is consistent and always correct
The typical user success rate is generally lower than the success rate of the method if used perfectly.

100 Percent Effectiveness:

Abstinence is the only 100 percent effective method in preventing both pregnancy and sexually transmitted diseases. All other birth control options carry some risk of failure.

Highly Effective Methods:

The ParaGard IUD (Copper T 380A) , the Mirena IUD, Implanon, Depo Provera Injections, Tubal Ligation, and Vasectomy tend to be the most highly effective methods of birth control.

  • These all have typical user rates of 97 to 99 percent
  • This means that out of 100 people who use these methods for a year, 3 or less will become pregnant
In general, methods that require less for a person to do tend to have lower failure rates.

Methods with High Effectiveness Rates:

Birth control pills (both combination and progestin-only) and other prescription options such as The Patch and The NuvaRing tend to have a high typical user success rates of around 92 percent.

  • This means that out of 100 women who use one of these methods for a year, 8 will become pregnant

Continuous breastfeeding (Lactational Amenorrhea Method – LAM) is another birth control method that yields a high typical use effectiveness rate.

  • This method tends to be 95 percent effective
  • For every 100 women who use LAM, 5 will become pregnant within the first 6 months
It is important to point out that this effectiveness rate only applies to women who are exclusively breastfeeding. This means that a woman feeds her baby at least 6 times a day with both breasts, does not substitute other foods for breast milk, and feeds her baby every 4 hours during the day and every 6 hours at night. Additionally, this method is not as effective if a woman has had a period since giving birth. A woman should also not rely on this method once she is 6 months post partum. After 6 months, the Lactational Amenorrhea Method is no longer a reliable form of birth control.

Moderately Effective Methods:

Natural family planning methods (combined) tend to provide moderate typical user success rates, from 78 to 88 percent.

  • Out of every 100 people who use one of the natural family planning methods (with the exception of withdrawal), 12 to 22 will become pregnant within the first year of use

Barrier methods, which include the male condom, female condom, diaphragm, spermicide, the cervical cap, and the sponge (for those who have not given birth) also yield fair typical user success rates between 71 to 85 percent.

  • Of every 100 people who use one of these barrier methods for a year, 15 to 29 will have an unintended pregnancy

No Method - A Comparison:

To have a reference point to compare these levels to, it may be helpful to know that statistics indicate that women who are sexually active for one year and do not use a contraceptive method have an 85 percent chance of becoming pregnant in that year.

    This means that out of 100 women who fit this profile, approximately 85 will become pregnant.
It is important to note, however, that this number is highly variable and is dependent on a woman’s age and how frequently she engages in intercourse.

A woman is also more likely to become pregnant is she has unprotected sex during her most fertile days of her cycle.

A Final Thought:

It is important for you to evaluate the effectiveness of contraception and carefully consider which level of reliability you feel most comfortable with. Additionally, keep in mind that certain factors may greatly affect the effectiveness of contraception:

For more detailed information on the effectiveness of each method:

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