Pattern fill was actually merged into the same group as Vectors actually. We've included all fills (color, gradient, pattern) into this group. We could have probably excluded pattern fill and included into bitmaps but the difference would be really small - about 0.7%

Thanks. Those seems like sensible choices. :)

It's the percentage of layers that contained these style. 5% did not have any effects. We've only analyzed vector shapes for this. We could have present that more clearly.

Thanks for the additional info!