Choosing the right method of contraception for you is not about numbers, it involves recognizing the reality of your circumstances and behaviour.
Some contraceptives involve active use every day (the pill) or every time you have sex (male condom, female condom, other barrier methods). These methods can be safe, but they demand perfect use to maximize their potential. With pills, for example, this means taking each daily pill at the same time each day and learning which medications which cancel their effect. With condoms and other barriers, this involves acquiring the skills to put it in (on) and take it out (off) properly, before actual use.
For this reason, we provide safety rates both for Perfect Use and for Typical Use. Anyone who is not certain about their ability to use their contraceptive correctly and consistently, should consider selecting a method that leaves no room for mess ups, ie. where the perfect use and typical use are identical.