I have three groups and I'm comparing two graphs in each group using the t-test: the absolute difference between two graphs in the first group is 34 with a p=0.024. (*) The absolute difference in the second group is 28 with a p=0.04 (*) and in the third group the absolute difference is 4 but the p value is=0.010 (**)
How do I explain this data? The absolute value in the first and second group is higher; however, the significance is less than the comparison in group three where the absolute value difference between two groups is only 4. So, should I say there was more change in group three (**) than in group 1 and 2 although the absolute difference (4) is less in this group?