thanks for pointing that out. I had read the full text of most of those and technically the abstract is supposed to sum up the findings of the study. Apparently the program I was using doesn't work the typical way. I will edit the post and get some relevant information up there ASAP.

By the way, old studies still have good information in them and are not invalid due to age. As long as they followed good scientific guidelines with sound methodologies their findings are as valid as any newer study (in general).