Table 1.

Univariate descriptives for the raw and composite scores.

Type of measure	Tasks	N	Mean	SD	Median	Min	Max	Skew	Kurt.
TIME 1
Age (in months)	–	68	56.00	10.54	56.0	38.00	80.00	0.12	−0.90
Nonvb. intelligence	Raven	68	16.00	4.05	15.50	8.00	27.00	0.59	0.09
Trait anxiety	Spence	68	28.50	14.36	25.0	6.00	68.00	0.55	−0.42
Verbal STM	Word span	66	3.60	0.74	3.70	2.00	5.30	0.02	−0.17
	Digit span	66	4.00	0.84	4.00	2.00	6.30	0.31	0.53
Visuospatial STM	Corsi blocks	68	2.80	0.66	2.70	1.66	5.00	0.81	0.92
TIME 2
Verbal STM	Word span	68	4.00	0.63	4.00	2.33	5.30	−0.21	−0.28
	Digit span	68	4.20	0.83	4.00	2.33	6.30	0.35	−0.32
Visuospatial STM	Corsi blocks	68	2.90	0.70	2.70	1.33	5.00	0.47	0.17
Verbal WM	Counting span	63	1.62	0.58	1.50	1.00	3.00	0.54	−0.75
	Backward span	63	1.11	0.59	1.00	0.17	2.70	0.19	−0.25
	Listening span	61	1.23	0.67	1.33	0.33	2.30	−0.44	−1.44
Visuospatial WM	Mr. X	63	0.84	0.53	0.84	0.17	1.70	0.27	−1.32
	Odd-one-out	63	1.61	0.51	1.50	0.67	2.70	0.15	−0.77
Response suppression	Statue	68	25.65	4.80	27.00	10.00	30.00	−1.77	2.58
Response conflict	Stroop matrix accuracy	68	13.94	2.97	15.00	2.00	16.00	−1.86	3.77
	Stroop matrix IE	66	1.61	0.77	1.40	0.69	4.20	1.44	2.01
	Knock and Tap	67	27.21	2.78	28.00	18.00	30.00	−1.31	1.46
Shifting	Post-switch DCCS	67	4.24	1.94	6	1	6	−0.33	−1.70
Composite measures	Vb. WM	61	1.32	0.52	1.39	0.50	2.28	0.08	−1.02
	Vs. WM	63	1.23	0.46	1.17	0.42	2.17	0.30	−0.88

Inverse efficiency (IE) was calculated as response time divided by accuracy. Kurt., Kurtosis.