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:Two of the five substrains (6J and KSJ) had significantly different MJT on the 28-day flurothyl retest as compared to their MJT on trial 8 of the induction phase (6J: t12 = 2.85; P,0.01; KSJ: t12 = 3.62; P,0.002; Fig.
Category: