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:The finding that BMI is closely related to TBF and PBF derived from DXA is compatible with several previous investigations in children over a wide age range and in adults (7, 13, 14, 16, 22, 24, 30, 32, 36).
Category: