RE:Beta glucan for LDL reduction. Great question.
From memory, 8% or so is considered significant. Keep in mind that a 8% improvement can move a patient to a lower level of risk, some patients cannot tolerate the side effects of statins.
There will be a limited number of lower risk patients who could see the BG pill as a complete replacement for statins or some persons taking it as a preventative measure. Ceapro was only considering the BG pill as an add on therapy, but patients wanted to trial it as a stand alone, thus a change was asked for and authorized in testing protocol by Health Canada. Health Canada study references are for barley BG (and appears to imply oat BG was better) whereas Ceapro is using oat BG and oat BG is highly water soluable compared to other BG so the efficacy could be much better.
How effective is a PGX BG pill wrt efficacy relative to other forms of BG is not part of this study. If I recall the PGX BG pill can be made to be essentially pure. Supplements avail have say 1000 mg (1 g) and the study is with pills at 1.5 / 3 / 5 g and different types of BG.
Amarin has a fish oil pill as an alternate to statins and fish oil has been known to reduce LDL.