34 ms·
it's calculated as percentage of unintended pregnancy during one year of use. http://web.archive.org/web/20080531095926/http://www.contraceptivetechnology.com/t
by yeonhoyoon 13y ago
it's calculated as percentage of unintended pregnancy during one year of use.
http://web.archive.org/web/20080531095926/http://www.contraceptivetechnology.com/table.html http://web.archive.org/web/20080531095926/http://www.contrac...