PI for Pioneer

I try to record Verbatim DVD+RW 4x and Sony DVD+RW 4x by Pioneer 108. Both discs have PI from 20 to 200. But there is high value PI=1386 near 4,2 Gb. This valur very short. What does it mean? Is it bad or normal for Pioneer 108?

We don’t know. If the disc works, then don’t waste your time checking PI/PO errors.

It is seems to be a good idea. But there is opinion that discs`s quality depend on PI. Is it true?