Generally speaking, we've found based on the personal experience of the volunteers, sexperts, and some users that people who experienced condom failures tending to be using Trojans at the time of the failure.
I know there are some statistics floating around, and I believe there are some statistics about condoms made in the US not being tested for quality as strictly as those made outside the US. I don't have them on hand right now though...(if anybody else knows, take a crack at it, otherwise it might take me a couple of days..), but I'll look harder when I get a chance.
Copyright 1998, 2014 Heather Corinna/Scarleteen
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