Birth control effectiveness

So this might be a dumb question, but I've always wondered it. I am on the patch and I put it on on time and it always stays on so its put on correctly. It says 6 out of 100 women get pregnant while on the patch. My question is the effectiveness of a birth control that's not a condom, like the patch. Is it this effective only wearing the patch or is the effectiveness from wearing the patch, using a condom, or pulling out? So is this effectiveness just from the patch not extra protection?