Hi, the presence and distribution of LBP (Lewy body pathology) was/were variable within families" It's hard to say without some understanding of this medical terminology. It sounds like a plural subject to me, thus 'were'. But if the whole subject phrase is thought of 'as a logical unit' by the writer, he might say 'was'.
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The17pointscale"the presence and distribution of LBP (Lewy body pathology) were variable within families"That's my view of it.
-- would you use 'was' or 'were'?