 With typical use the rate of pregnancy is 18% per-year.. 
Wọ́n sin tí yàn án fún àmì ẹ̀yẹ fún òṣèrébìnrin tí ó dára jù ní ipò amúgbálẹ́gbẹ̀ẹ́ Olú-ẹ̀dà Ìtàn Lọ́dún 2009 àti 2011.Àwọn Ìtọ́kasíàwọn òṣèré ará Nàìjíríààwọn ará Nàìjíríà.. 