Subject GRE math scores

[SheldonCopper]

Hi all, as you all know, there are some statistics Ph.D. programs like Chicago, UW, Columbia and Wharton which highly encourage applicants to take subject GRE math exam. I am wondering what score range would be plus/minus factor. Stanford says their admitted average math GRE percentile is 82% but I assume it is higher nowadays so I am not really counting on this. Overall belief in math application is one should at least get 800 for top schools so I am just wondering what score range would be regarded as good/mediocre/bad in statistics. On top of it, is it true that statistics department expect international students to score higher than domestic students? I am just asking this since there is data telling incoming OSU Ph.D. in math had quite a significant discrepancy in average subject math GRE score between international students and domestic ones.