How effective is the Leas shield in preventing unwanted pregnancy?
In the limited number of trials completed to date, the effectiveness of Lea’s Shield compares very favorably with other female barrier methods, with a failure rate of 6.4 per 100 women when used with a spermicide and 12.2 per 100 women at six months when used without a spermicide. The Pearl index is 13-24/100 women years (failure rate for 100 women using the method for one year).
