Unintended pregnancies within first year of use (%)26
Method		Typical use*	Perfect use †	Women continuing use at one year (%)26	Frequency of use	Protection against STDs8	Use while breastfeeding8	Cost‡
None		85	85	—	—	—	—	—
Spermicide		29	15	42	Each time	No §	Yes	$ 0.35 to 12
Withdrawal		27	4	43	Each time	No	Yes	None
Periodic abstinence
	Calendar method	25	9	∼ 50	Each time	No	Yes	None
	Ovulation method	25	3	∼ 50	Each time	No	Yes	None
	Symptothermal method‖	25	2	∼ 50	Each time	No	Yes	None
	Postovulation method	25	1	∼ 50	Each time	No	Yes	None
Cervical cap: parous women∥		32	26	46	Each time	No	Yes	30 to 40
Cervical cap: nulliparous women∥		16	9	57	Each time	No	Yes	30 to 40
Diaphragm∥		16	6	57	Each time	Yes#	Yes	30 to 40
Female condom		21	5	49	Each time	Yes	Yes	2 to 3 each
Male condom		15	2	53	Each time	Yes	Yes	0.50 to 2 each
OCPs		8	0.3	68	Taken daily	No	** † †	20 to 50 per cycle
Contraceptive patch		Unknown	0.3	68	Applied weekly	No	**	36 per month
Vaginal ring		Unknown	0.3	68	Inserted every 4 weeks	No	**	43 per month
Progestin-only OCPs		3	0.3	56	Given every 12 weeks	No	Yes	30 to 35 every 3 months‡ ‡
Copper-containing IUD		0.8	0.6	78	Inserted every 10 years	No	Yes	250 to 300 every 10 years§ §
Levonorgestrel intrauterine system		0.1	0.1	81	Inserted every 5 years	No	Yes	300 to 400 every 5 years§ §
Female sterilization		0.5	0.5	100	Done once	No	Yes	1,200 to 2,500 ∥ ∥
Male sterilization		0.15	0.10	100	Done once	No	Yes	250 to 1,000