I have two sample groups with the same variables. For example, age and blood pressure for two groups. I would like to say that these two variables are correlated either at both corners (first group) or at the upper corner only (second group)
Variable A and B show strong correlation only at either both upper and lower corners or at one corner only.
I fee my sentence is very difficult to understand. How to use either and both (if I can) in my sentence.