Polyphenol count in Chinese Green Tea?

What sources of info have you found on japanese green tea? I would think it would be difficult to make any generalization about chinese green tea polyphenol content as would it not vary depending on the growing conditions, the soil and the varietal? I'd love to know more about this.

Thanks, Wendi

I've read in several places that white tea has more of the goodities than green tea, but I wonder if they are comparing it to Chinese green, which is often, if not usually roasted, or to Japanese sencha, which isn't?

Peter