Each cylinder should be within 10% of eachother. So if you have readings between say 90 and 100, you are OK. If I remember correctly, the C should have a 6:1 ratio, so 110-120 would be right. The repair manual will give you the factory specs.
While making a determinaation as to the health of an engine based on compression is not an absolute, the actual test and the correct factory specs ARE absolute.