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:…aside from socioeconomic or family risk, families qualified for the original study if children scored in the clinical range on the Intensity or Problem Scales of the Eyberg Behavior Inventory, which comprised 44 % of the sample at recruitment (see Dishion et al. 2008; Robinson et al. 1980).
Category: