Table 1.
Descriptive statistics and Cronbach's Alphas.
| Variable | No. of blocks | M YA/OA | SD YA/OA | Skew YA/OA | Kurtosis YA/OA | α YA/OA |
|---|---|---|---|---|---|---|
| RS | 12 | 0.87/0.80 | 0.11/0.14 | –1.22/–0.81 | 0.88/0.35 | 0.71/0.77 |
| CS | 15 | 0.85/0.74 | 0.16/0.12 | –3.16/–0.49 | 14.02/–0.08 | 0.90/0.72 |
| RoS | 12 | 0.82/0.54 | 0.13/0.15 | –1.52/–0.44 | 4.04/–0.43 | 0.77/0.75 |
| NBN | 6 | 0.89/0.75 | 0.09/0.10 | –0.86/–0.17 | 0.09/–0.09 | 0.92/0.92 |
| NBS | 8 | 0.85/0.70 | 0.11/0.10 | –0.91/–0.04 | 0.13/–0.46 | 0.95/0.95 |
| MUN | 12 | 0.79/0.58 | 0.17/0.21 | –1.32/–0.36 | 2.17/–0.22 | 0.85/0.88 |
| MUS | 24 | 0.64/0.43 | 0.16/0.13 | 0.25/0.04 | –0.41/–0.41 | 0.91/0.84 |
| AS | 12 | 0.73/0.60 | 0.09/0.08 | –0.35/0.05 | 1.01/–0.58 | 0.81/0.81 |
| ANI | 8 | 0.84/0.57 | 0.12/0.13 | –1.94/0.54 | 6.41/0.04 | 0.84/0.76 |
RS, reading span; CS, counting span; RoS, rotation span; NBN, n-back numerical; NBS, n-back spatial; MUN, memory updating numerical; MUS, memory updating spatial; AS, alpha span; ANI, animal span; α, internal consistencies (Cronbach's alpha); YA, younger adults; OA, older adults.