Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:These results suggested that an ABI,0.9 and high baPWV might be related to LVH. Previous studies had reported that a low ABI might be related to the interarm SBP difference and LVH [4,33,34].
Category: