Table 1. Descriptive Statistics by Age Group.
| Age group | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Variable | 24–29 (N = 181) | 30–39 (N = 253) | 40–49 (N = 430) | 50–59 (N = 534) | 60–69 (N = 382) | 70–79 (N = 312) | 80–91 (N = 135) | All (N = 2227) | Age r |
| Age, M (SD) | 26.25 (1.72) | 34.21 (2.82) | 44.86 (2.97) | 54.34 (2.83) | 64.30 (2.82) | 74.15 (2.78) | 83.21 (2.84) | 54.17 (16.06) | |
| WAIS-III vocab ss, M (SD) | 13.47 (2.95) | 12.17 (3.41) | 11.83 (2.94) | 12.82 (2.82) | 13.33 (2.41) | 13.12 (3.03) | 13.64 (2.84) | 12.79 (2.95) | .10 |
| WAIS-III digit sym ss, M (SD) | 11.80 (2.66) | 11.82 (3.05) | 11.03 (2.89) | 11.68 (2.95) | 11.43 (2.54) | 11.83 (2.87) | 11.70 (3.01) | 11.56 (2.86) | .02 |
| WMS-III log mem ss, M (SD) | 11.87 (2.81) | 11.72 (2.71) | 11.46 (2.73) | 12.05 (2.83) | 12.47 (2.75) | 12.44 (2.82) | 12.26 (3.13) | 12.02 (2.82) | .10 |
| WMS-III recall ss, M (SD) | 12.72 (3.48) | 12.18 (3.17) | 12.28 (3.30) | 12.69 (3.32) | 13.09 (3.10) | 12.37 (3.19) | 11.77 (3.48) | 12.52 (3.28) | .01 |
| Education, M (SD) | 15.88 (2.25) | 16.05 (2.79) | 15.44 (2.56) | 16.06 (2.58) | 16.38 (2.72) | 15.79 (2.96) | 16.08 (3.09) | 15.94 (2.70) | .02 |
| Male (0) vs. female (1) | 0.65 | 0.72 | 0.76 | 0.69 | 0.64 | 0.58 | 0.50 | 0.67 | −.11 |
| Score reliability, rOE, (SD) | |||||||||
| Matrix reasoning Gf | 0.75 (15.00) | 0.83 (16.32) | 0.76 (14.29) | 0.74 (14.18) | 0.75 (14.31) | 0.74 (13.89) | 0.76 (13.06) | 0.81 (16.59) | −.49 |
| Shipley abstraction Gf | 0.81 (15.00) | 0.85 (16.68) | 0.88 (18.11) | 0.84 (16.71) | 0.80 (16.31) | 0.84 (18.77) | 0.90 (19.92) | 0.86 (18.67) | −.38 |
| Letter sets Gf | 0.74 (15.00) | 0.79 (15.27) | 0.74 (16.37) | 0.71 (15.86) | 0.72 (16.39) | 0.71 (17.49) | 0.79 (20.67) | 0.77 (17.61) | −.33 |
| Form boards Gv | 0.89 (15.00) | 0.89 (14.58) | 0.86 (11.41) | 0.85 (12.49) | 0.82 (11.01) | 0.83 (10.48) | 0.80 (8.83) | 0.87 (12.98) | −.36 |
| Paper folding Gv | 0.77 (15.00) | 0.84 (17.01) | 0.74 (15.29) | 0.69 (14.47) | 0.71 (14.37) | 0.59 (12.87) | 0.60 (12.50) | 0.75 (15.71) | −.37 |
| Spatial relations Gv | 0.93 (15.00) | 0.93 (15.67) | 0.89 (13.43) | 0.89 (12.97) | 0.86 (12.01) | 0.82 (10.42) | 0.73 (9.11) | 0.90 (13.71) | −.34 |
| WAIS vocab Gc | 0.92 (15.00) | 0.95 (18.39) | 0.92 (16.31) | 0.91 (14.74) | 0.92 (13.01) | 0.92 (15.72) | 0.92 (14.29) | 0.92 (15.54) | .05 |
| WJ picture vocab Gc | 0.90 (15.00) | 0.90 (15.39) | 0.90 (15.22) | 0.87 (12.64) | 0.83 (11.93) | 0.84 (12.56) | 0.85 (14.81) | 0.88 (14.27) | .19 |
| Synonym vocab Gc | 0.79 (15.00) | 0.82 (16.59) | 0.79 (15.00) | 0.83 (14.07) | 0.80 (12.66) | 0.80 (13.36) | 0.82 (13.34) | 0.82 (14.81) | .24 |
| Antonym vocab Gc | 0.72 (15.00) | 0.81 (17.40) | 0.84 (17.01) | 0.87 (16.58) | 0.81 (14.95) | 0.84 (16.60) | 0.90 (16.63) | 0.84 (16.66) | .13 |
| Recall Gm | 0.90 (15.00) | 0.85 (14.36) | 0.88 (14.73) | 0.90 (15.21) | 0.91 (15.40) | 0.92 (16.88) | 0.94 (19.08) | 0.91 (17.31) | −.42 |
| Log mem Gm | 0.77 (15.00) | 0.74 (15.00) | 0.77 (14.63) | 0.75 (14.20) | 0.72 (13.19) | 0.76 (13.57) | 0.85 (17.79) | 0.77 (14.93) | −.24 |
| Paired associates Gm | 0.74 (15.00) | 0.84 (16.50) | 0.75 (15.47) | 0.80 (15.59) | 0.75 (15.28) | 0.76 (13.92) | 0.65 (11.00) | 0.80 (16.21) | −.36 |
| Pattern comparison Gs | 0.75 (15.00) | 0.80 (15.77) | 0.83 (15.18) | 0.81 (13.48) | 0.78 (12.36) | 0.86 (11.92) | 0.88 (12.85) | 0.87 (16.28) | −.53 |
| Letter comparison Gs | 0.91 (15.00) | 0.91 (13.98) | 0.93 (13.79) | 0.93 (13.78) | 0.93 (12.51) | 0.92 (12.83) | 0.94 (13.80) | 0.93 (15.70) | −.50 |
| Digit sym Gs | — (15.00) | — (17.44) | — (16.37) | — (15.77) | — (14.56) | — (15.00) | — (16.85) | — (19.53) | −.59 |
Note. Descriptive statistics are based on raw data with pairwise deletion to handle missing data. Age and education are reported in years. Correlations that are significantly different from 0 at p < .01 are in bold. Dashes show that the reliabilities for the digit symbol test could not be computed because the test does not contain distinct items. WAIS-III = Wechsler Adult Intelligence Scale—Third Edition; vocab = vocabulary; ss = scaled score; log mem = logical memory; sym = symbol; WMS-III = Wechsler Memory Scale—Third Edition; Gf = fluid reasoning; Gv = spatial reasoning; Gc = verbal knowledge; WJ = Woodcock–Johnson Psycho-Educational Battery-Revised; Gs = processing speed; Gm = episodic memory; rOE = odd-even split half reliability corrected with the Spearman-Brown prophecy formula.