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:Previous studies have revealed that the 3MT had a moderate to high test–retest reliability (Burnley et al. 2006; Johnson et al. 2011; Cheng et al. 2012) and that the end-test power (EP) derived using the 3MT can appropriately determine the CP value estimated using the traditional work − time and power − 1/ time CP models (Vanhatalo et al.
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