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:As for soluble P-selectin levels, these were slightly higher in the unstable patients, and this was again due to the female part of the unstable group (median and interquartile range for unstable women 44 [3159], for unstable men 38 [29-42] and for stable women 34 [30-42] ng/ml).
Category: