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Heterogeneity of the factors.
| Factor | Q (df) | I 2 |
|---|---|---|
| Memory | 36.14 ** (17) | 52.96 |
| Attention | 32.30 * (18) | 44.29 |
| General cognitive performance | 37.37 ** (5) | 86.62 |
Notes. Q = Cochran’s Q. df = degrees of freedom, I2 = according to DerSimonian and Laird. * = p < 0.05. ** = p < 0.01.
