Efficacy of the transdermal contraceptive patch*

Study	Cycles	Pregnancies	Perfect use^¶	Typical use^Δ
Noncomparative trial	10,994	6	0.59	0.71
Oral contraceptive, comparative trial	5921	4	0.66	0.88
Oral contraceptive, comparative trial	5240	5	0.99	1.24
Combined total	22,155	15	0.7	0.88

* Pregnancies per 100 woman-years.
¶ Failure (pregnancy) when taking correctly.
Δ Perfect use failure plus user failure.

Adapted with permission from: Burkman RT. The transdermal contraceptive patch: a new approach to hormonal contraception. Int J Fertil Womens Med. 2002; 47(2): 69-76. Copyright ©2002 MSP International, Inc.

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