That is an interesting study.
I would like to mention a few things about it. First of all, the 2 groups involved were abstinence only and something that didn’t promote abstinence at all. From my knowledge, the sex ed programs at schools now are a mix of both abstinence and safe sex (with an emphasis on abstinence). I might be wrong about that, but I believe that is how they are. So, it isn’t just comparing abstinence only to what we have now, it is comparing abstinence only to another extreme.
Also, I would like to point out that there is definitely an incentive to lie about having sex if you are in the abstinence only group. Think about a 14 year old girl that was taught she shouldn’t be having sex for two years, but did anyway. Then think about what she is going to put on a survey about it…there is a good chance she will lie and say she didn’t have sex. This wouldn’t be the same in the group that heard only safe sex, because they were not told they shouldn’t be having sex at all, so why lie about it?
So, in my opinion, the study is probably not that accurate. I am SURE that there are far more qualified people that have looked at the study and made similar judgments about it. This is just basic statistics.