a0	E(β4\y,y0) (95% CrI)	Pr(β4 > 0\y,y0)
0	0.57 (-0.03, 1.17)	0.97
0.25	0.64 (0.07, 1.23)	0.98
0.50	0.68 (0.12, 1.30)	0.98
0.75	0.71 (0.11, 1.35)	0.99
1	0.74 (0.11, 1.43)	0.99
Table 5: Posterior results for the period x group interaction term (β4) for EPP model under various choices for a0