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 results found in present study confirm the studies carried out by Davison et al. (2008); Dollman & Lewis (2007) and Timperio et al. (2006), which point out the existence of a tendency of boys to commute actively more often than girls.
Category: