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:Functional measures that might reflect the consequences of uraemia were the Mini Mental State Examination (MMSE) [15], Geriatric Depression Score (GDS) [16], eight item Activities of Daily Living (ADL) and a single question on general health perception were administered.
Category: