. Author manuscript; available in PMC: 2017 Feb 1.

Published in final edited form as: Dev Psychol. 2016 Feb;52(2):326–340. doi: 10.1037/dev0000075

Table 1.

Descriptive Statistics

Task	N	Mean	SD	Min	Max	Skewness	Kurtosis	Reliability
Wave 1
Antisaccade^a	779	1.04	0.20	0.47	1.57	−0.12	−0.26	.89^b
Stop-signal	741	282 ms	63	151	489	1.13	1.51	.75^b
Stroop	759	214 ms	90	0	488	0.59	0.19	.91^b
Keep track^a	774	0.94	0.18	0.38	1.49	0.31	0.56	.65^c
Letter memory^a	785	1.09	0.25	0.38	1.57	0.29	−0.20	.62^c
Spatial 2-back^a	777	1.17	0.17	0.65	1.57	−0.93	1.65	.90^c
Number–letter	776	331 ms	183	–14	923	1.04	1.12	.86^b
Color–shape	768	331 ms	189	–196	916	0.76	0.75	.85^b
Category-switch	766	333 ms	181	–34	899	0.98	0.92	.83^b
Wave 2
Antisaccade	748	0.62	0.16	0.20	0.96	–0.13	–0.67	.90^c
Stop-signal	735	215 ms	30	116	315	–0.23	0.25	.63^c
Stroop	737	156 ms	74	–73	387	0.71	0.71	.96^b
Keep track	749	0.72	0.09	0.44	0.96	–0.36	0.11	.66^c
Letter memory	749	0.70	0.13	0.38	1.00	0.22	–0.64	.92^c
Spatial n-back^d	749	–0.01	0.91	–2.74	2.70	–0.31	–0.03	.75^b
2-back^a	745	1.08	0.17	0.64	1.45	–0.53	–0.24	.92^c
3-back^a	745	0.97	0.11	0.62	1.40	0.03	0.45	.78^c
Number–letter	748	246 ms	157	–241	735	0.91	0.92	.91^b
Color–shape	743	221 ms	182	–239	792	1.05	1.19	.90^b
Category-switch	747	198 ms	161	–81	735	1.14	1.28	.94^b

Note. Min = minimum; Max = maximum.

Accuracy scores were arcsine transformed.

Internal reliability was calculated by adjusting split-half or part1–part2 correlations with the Spearman–Brown prophecy formula.

Internal reliability was calculated using Cronbach’s alpha.

Average of z-scores for the 2- and 3-back tasks.