On a average, failure rate in the couples using condom is about

Condoms can be a highly effective method of contraception, if they are used correctly. Failure rates for the condom vary enormously. Survey has been repoed pregnancy rates bearing from 2 to 3 per 100 women years to more than 14 in typical users. Most failures are due to incorrect use Reference: Park&;s textbook of Preventive and social medicine 23rd edition; Page number 494