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:Despite no significant changes in active GLP-1 levels, 2.3- and 2.2-fold higher insulin (P = 0.045) and IGF-1 levels (P = 0.0045) were found in R6/2 mouse cortex compared to WT littermates (Fig.
Category: