The basis of the FAA study was that its obvious that the more fatigued you are the higher the possibility of an incident. However there was not any statistical evidence to back this up. The statistical rise is dramatic at duty periods exceeding 13 hours. At the moment some EU contries have NO flight time limitations. The current proposal by the EU is for a 14 hour limit, not based on any science at all. Got to hope the UK retains its 13 hour limit.
Good advertising campaign ,Fly BA- you are 5.6 times less likely to have a crash than an Austrian carrier.