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How many pregnancies per 100 women may occur in a year while using the patch​
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How many pregnancies per 100 women may occur in a year while using the patch​

User Gnomet
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If you use it perfectly, the patch is 99% effective. But people aren't perfect, and it can be easy to make a mistake. so in reality, the patch is about 91% effective. That means about 9 out of 100 patch users get pregnant each year.
User Sukesh
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