Other numbers reflect failure rates per year when used correctly. In thinking about pregnancy, you might want to think about how you would respond to pregnancy. All except the last are easily cured. The range here is from no protection to perfect protection, for mutually monogamous relationships. Health benefits .
Hormonal methods reduce the risk of endometrial and cervical cancer later in life.
The weights are determined first by picking the most important attribute range and then comparing other ranges to that. You can pick the most important range in two ways. There are also two ways to determine weights. First, you could use the direct judgment method. For example, if pregnancy prevention is more important than STD prevention, lower the maximum of the pregnancy prevention dimension until the two ranges are equal.