Oh, you could always perform a wet test too. Just put some oil(a squirt or two, but not too much) in the cyl. you are going to test and see if the compression raises. If it does then it is most likely rings and cyl. wear. If it doesn't then it didn't really help any
All you know is that it could be a combination of rings and valves or both...but I would suggest trying this on the lowest one. The rule of thumb I have always heard is that there shouldn't be more than a 20% difference in the highest and lowest cyl. compression results.