Table 1.

Descriptive statistics (n, means, standard deviations and full information Pearson correlations) for the observed variables across the three waves.

	Cortical Thickness	Cortical Surface	Block design	Matrices	Simil.	Vocab.
n t1	304	304	430	430	430	430
Mean t1	.00	.00	.00	.00	.00	.00
SD t1	1.00	1.00	1.00	1.00	1.00	1.00
Cortical Thickness t1	1.00
Cortical Surface t1	.18	1.00
Block design t1	−.36	.06	1.00
Matrices t1	−.28	.07	.72	1.00
Similarities t1	−.32	.12	.72	.75	1.00
Vocabulary t1	−.42	.05	.78	.80	.86	1.00
n t2	313	313	363	363	363	363
Mean t2	−.20	.17	.56	.49	.52	.48
SD t2	1.06	1.01	.97	.63	.76	.81
Cortical Thickness t2	1.00
Cortical Surface t2	.25	1.00
Block design t2	−.39	.03	1.00
Matrices t2	−.37	.08	.69	1.00
Similarities t2	−.45	−.01	.71	.64	1.00
Vocabulary t2	−.48	−.02	.71	.67	.85	1.00
n t3	190	190	217	217	217	216
Mean t3	−.40	.14	.97	.75	.84	.87
SD t3	1.01	1.03	.85	.55	.62	.64
Cortical Thickness t3	1.00
Cortical Surface t3	.21	1.00
Block design t3	−.20	.06	1.00
Matrices t3	−.21	.03	.59	1.00
Similarities t3	−.40	−.03	.62	.48	1.00
Vocabulary t3	−.37	.01	.57	.51	.79	1.00

Note: Total n = 420. 47.7% females, 42.8% males. All the scores were standardized with the first occasion as the reference (mean = 0, sd = 1).