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:Our results are in agreement with previous findings of higher leptin levels in pubertal obese girls than in prepubertal obese girls[35] and decrease in leptin levels after the onset of puberty in boys, but an increase in girls[35].
Category: