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:Descriptive statistics are presented as means and SD or percentages. t-Tests and chi-square tests were performed to assess sex differences for PA, sedentary time, physical fitness components (BMI, push-ups, curl-ups, and sit and reach), and the overall physical fitness score.
Category: