Table 2.

Two-line regression for performance measures (Simonsohn, 2018). “Slope 1” and “slope 2” indicate the slopes of the younger and older group, respectively. “Age” indicates the age cut off that separates the younger and older group of participants. P-values and significance are reported separately for each group. A U-shaped relationship is present when the slopes of the younger and older groups are both significant, with opposite signs. The existence of such a U-shape is indicated by a star in the “U” column.

Performance measure	Slope 1	$p$	sig.	Slope 2	$p$	sig.	Age	U
Overall accuracy	0.91	0.002	**	−0.16	0.028	*	13.29	*
Points won	1.51	$<0.001$	***	−0.3	0.002	**	13.66	*
RTs (correct trials)	−20.53	$<0.001$	***	6.63	0.030	*	18.92	*
Number of blocks	0.11	0.002	**	−0.03	0.043	*	14.55	*
Stay after (pot.) switch	5.15	$<0.001$	***	−0.35	0.53	–	15.13	–
Asympt. perf.	0.01	0.0007	***	0	0.36	–	14.74	–