How can I present the significance of two statistical tests in one table?
Those stars (three on all but two entries) use lots of real estate and are very distracting. Footnotes for just those two would help whatever else you do.
Without the stars you might be able to report the second set of results this way:
xx.x (yy.z)

with the caption explaining the parenthetical numbers.
You can also format to make better column width choices.
Please align the columns on the decimal points.