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 peak femoral strains in the proximal-lateral femoral shaft calculated for walking and stair ascent were consistent with corresponding strain measurements reported by Aamodt et al. (1997); mean peak tensile and compressive strains calculated for the 10 participants ranged from 1351 to 1647 με and 971 to 988 με, respectively, compared to corresponding strains of 1198–1454 με and 393–948 με measured from two hip syndrome patients.
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