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Of course, there are other effects (apart from PR) which influence the ranking of your page. Therefore, there might be a positive effect for your ranking even if PR is decreased. I have outgoing links on my site, but normally I don't put them on the index page.
There's actually about 40 links off the index page, albeit most are internal, and the site has been at pr 6 for a while now. The article pages attached to those links are all pr 5.
BMach, as an experiment, I added 6 links to related "authority" pages at the bottom of my index page. PR didn't drop ...
With a total of 40 links the decrease for internal pages is small, i.e. less than 0.1 in units of toolbar PR. Therefore, you are not seeing an effect. The decrease for your index page is even smaller.