Check out the faction number tables on the Wiki here:
http://wiki.project1999.com/Faction
According to them, apprehensive should be either a 100 or 150 points range. I have kept track of my Commonlands orc slaughter, and at ~650 faction hits (entries in my log saying "Your faction standing with AshenOrder got better") I was threatening to AshenOrder. At ~950 hits I was apprehensive. Now at 1298 hits I am still apprenhensive.
Does anyone else have data indicating that the apprehensive range is bigger?