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2 when truncating users after 12 months.

4 Division of Clinical Pharmacology 3, Office of Clinical Pharmacology, Office of Translational Sciences OTS , Center of Drug Evaluation and Research CDER , US Food and Drug Administration FDA , Silver Spring, MD, USA.

1 Division of Clinical Pharmacology 3, Office of Clinical Pharmacology, Office of Translational Sciences OTS , Center of Drug Evaluation and Research CDER , US Food and Drug Administration FDA , Silver Spring, MD, USA.

There are two calculation methods for determining the Pearl Index: In the first method, the relative number of pregnancies in the study is divided by the number of months of exposure, and then multiplied by 1200.

Being lost to follow-up A common misperception is that the highest possible Pearl Index is 100 — i.

of patient observed X months of use B No.

If three pregnancies occur during this period in this group, the Pearl index will be 3.

The overall HR of 1.

76 3 Pt 2 : 558—567.