I think the stats are meaningless. You do not have a "representative sample" to begin with. Simply the title of your post scared off anyone who carries a heavier pack. You never adjusted for conditions. Believe me, I would pack differently for a trip to the High Sierra vs a trip in Alabama. And your "average weight" backpacker with the "assumption" that we are under the national average is also bogus. Throw out my pack weight- I am so far under your average body weight that I skew everything! Also, because I think we are on the older side in this forum, I would guess quite a few are NOT 10% under the average weight. I suggest that if you are serious about this kind of "study" then get some real training in statistics. Man, it really must be raining where you are from! Too much time on your hands!