 The typical use pregnancy rate among condom users varies depending on the population being studied , ranging from 10 to 18 % per year . The perfect use pregnancy rate of condoms is 2 % per year . Condoms may be combined with other forms of contraception ( such as spermicide ) for greater protection . 
 The typical use pregnancy rate among condom users <a href='uninflect' title='1'><mark>varies</mark></a> depending on the population being studied , ranging from 10 to 18 % per year . The perfect use pregnancy rate of condoms <a href='drop_aux' title='2'><mark>is</mark></a>2 % per year . Condoms may be combined with other forms of contraception ( such as spermicide ) for greater protection . 
The typical use pregnancy rate among condom users vary depending on the population being studied , ranging from 10 to 18 % per year . The bumpin use pregnancy rate of condoms 2 % per year . Condoms may be combined with other forms of contraception ( such as spermicide ) for greater protection .