1993 Ford Aerostar finding compression leaks

My repair manual does not say the what compression should be on a good motor but that the minimum is 101. It shows the chart that references a 75 percent maximum difference between the lowest and highest compressions whereas a high 200 and a lowest 150 would be pushing the limits. The chart starts at 101 as the lowest and max 250 is 250 what the car had when it was new?
my manual tells how to do a compression check the proper way but where it says if there is a significant difference between the wet and dry compression results
would indicate the rings are definitely worn, what is a significant amount to expect