WAIS-III 8 Subtest Short Form 2

Supplementary Table A

Means, Standard Deviations (on the Diagonal), and Intercorrelations (Above the Diagonal) among Wechsler Adult Intelligence Scale—Third Edition Subtest (WAIS-III) Age-Scaled Scores

Voc / Sim / Ari / DSp / Inf / Com / LNS / PC / DSC / BD / MR / PA / SS / OA
Voc / 4.00 / .79 / .69a / .57a / .79 / .81a / .61a / .57 / .57a / .60a / .67a / .67a / .59a / .59a
Sim / 3.68 / .67a / .50 / .73 / .78a / .52 / .53 / .45 / .58 / .60 / .59 / .52 / .55
Ari / 3.51 / .67a / .66 / .69a / .62 / .48 / .55a / .64a / .64 / .60a / .59 / .54a
DSp / 3.02 / .49 / .55a / .73b / .38 / .47 / .50a / .50 / .52a / .47 / .40a
Inf / 3.34 / .72 / .50 / .51 / .43 / .54 / .56 / .57 / .43 / .52a
Com / 4.22 / .56a / .49 / .49a / .59 / .64a / .64a / .55a / .54
LNS / 3.42 / .39 / .48 / .48 / .57 / .50 / .50 / .39
PC / 3.66 / .50 / .64a / .63a / .60a / .56 / .66a
DSC / 3.17 / .53a / .51 / .53a / .72 / .51a
BD / 3.64 / .75b / .67b / .63a / .75b
MR / 3.62 / .69b / .60a / .66b
PA / 3.56 / .60a / .68b
SS / 3.35 / .50
OA / 3.44
M / 11.13 / 10.21 / 9.16 / 9.62 / 10.67 / 10.91 / 9.24 / 8.73 / 7.62 / 9.43 / 10.85 / 9.47 / 8.07 / 8.78

Note. Voc = Vocabulary; Sim = Similarities; Ari = Arithmetic; DSp = Digit Span; Inf = Information; Com = Comprehension; LNS = Letter–Number Sequencing; PC = Picture Completion; DSC = Digit Span–Coding; BD = Block Design; MR = Matrix Reasoning; PA = Picture Arrangement; SS = Symbol Search; OA = Object Assembly. Superscripts indicate that Fisher’s z-transformed correlations were significantly different from the population values reported for the standardization sample (The Psychological Corporation, 1997: Table 4.12) at an uncorrected level of z > 1.96a or a Bonferroni-corrected level (for the 91 coefficients) of z > 3.50b. N = 200 with exception of OA, for which values are based on N = 172.

WAIS-III 8 Subtest Short Form 7

Supplementary Table B

Reliability and Validity Measures for Two-Subtest Short-Form (SF) Estimates of Wechsler Adult Intelligence Scale—Third Edition (WAIS-III) Index Scores Derived Using Methods of Prorating (Pro) and Deviation Quotients (DQ)

Index SF
Combinations / rxx / rsf-fs
(Pro / DQ) / r′sf-fs
(Pro / DQ) / % within CI 90%
(Pro / DQ) / % within CI 95%
(Pro / DQ)

Verbal Comprehension

Voc + Sim
Voc + Inf
Voc + Com
Sim + Inf
Sim + Com
Inf + Com / .96
.94
.95
.93
.93
.91
.93 / .979 / .979
.976 / .974
.930 / .928
.977 / .976
.925 / .922
.933 / .932 / .936 / .939
.942 / .942
.902 / .904
.932 / .954
.874 / .877
.902 / .906 / 76.5 / 84.0
80.0 / 79.5
52.0 / 57.0
80.5 / 78.0
50.5 / 52.5
56.0 / 55.0 / 82.0 / 90.0
84.5 / 87.0
58.0 / 63.5
85.5 / 83.0
59.0 / 61.0
62.0 / 63.0

Perceptual Organization

PC + BD
PC + MR
PC + PA
BD + MR
BD +PA
MR+ PA
OA + PC
OA + BD
OA + MR / .93
.90
.91
.86
.93
.87
.88
.85
.86
.87 / .970 / .971
.966 / .965
.886 / .889
.959 / .958
.891 / .896
.880 / .883
.892 / .893
.897 / .849
.914 / .916 / .902 / .907
.905 / .908
.823 / .834
.909 / .913
.838 / .853
.841 / .853
.829 / .841
.844 / .806
.875 / .886 / 75.0 / 75.5
82.0 / 80.0
52.0 / 73.5
70.5 / 72.0
56.5 / 59.0
47.5 / 49.5
41.9 / 45.3
51.2 / 58.7
64.6 / 63.9 / 80.5 / 79.5
85.5 / 85.0
58.5 / 78.0
76.5 / 75.5
62.0 / 65.0
53.5 / 55.5
47.1 / 50.6
54.1 / 62.2
68.0 / 67.4
OA + PA / .81 / .818 / .823 / NA / NA / 41.9 / 40.1 / 47.1 / 48.2

Working Memory

Ari + DSp
Ari + LNS
DSp + LNS / .94
.93
.90
.91 / .964 / .964
.969 / .969
.952 / .953 / .916 / .919
.898 / .902
.890 / .896 / 84.5 / 84.5
88.0 / 90.0
79.0 / 77.5 / 87.5 / 88.5
91.5 / 94.0
86.0 / 83.0
Processing Speed
DSC + SS / .88 / 1 / .997 / .880 / .870 / 100 / 100 / 100 / 100

Note. Voc = Vocabulary; Sim = Similarities; Ari = Arithmetic; DSp = Digit Span; Inf = Information; Com = Comprehension; LNS = Letter–Number Sequencing; PC = Picture Completion; DSC = Digit Span–Coding; BD = Block Design; MR = Matrix Reasoning; PA = Picture Arrangement; SS = Symbol Search; OA = Object Assembly. rxx = reliability coefficients of full scales and SFs; rsf-fs = Pearson product–moment correlation between short-form and full-scale index score; r′sf-fs = short form–full scale validity coefficient corrected for redundant error variance; % within CI 90% and CI 95% = percentage of sample with SF scores within a 90% and 95% confidence interval, respectively, of the full-scale score; NA = correction not applicable for OA–PA combination because neither subtest contributes to the full index score. Values in boldface represent those for the subtest pairs contributing to the final prorated and DQ SF8s. Reliability values are shown to two decimal points, maintaining consistency with the values from the WAIS-III technical manual from which they were calculated (Psychological Corporation, 1997). The other sample-based measures are reported to three significant digits for increased accuracy.


Supplementary Table C

Reliability and Validity Measures for Wechsler Adult Intelligence Scale—Third Edition (WAIS–III) Short-Form (SF) Summary Scores

Summary SFs / rxx / rsf-fs / r′sf-fs / % within CI 90% / % within CI 95% / Bandwith for 90%
Verbal IQ (VIQ)
Prorated
1.Voc + Inf + Ari + DSp
2.Voc + Inf + Ari + LNS
2b.Voc + Inf + Ari
3.Sim + Inf + Ari + DSp
4.Sim + Inf + Ari + LNS
4b.Sim + Inf + Ari
Deviation Quotients
1.Voc+Sim+Ari+DSp
2.Voc+Sim+Ari+LNS
2b.Voc+Sim+Ari / .97
.96
.96
.96
.96
.95
.95
.96
.95
.95 / .977
.964
.972
.977
.964
.965
.982
.968
.975 / .952
.943
.951
.953
.939
.940
.963
.943
.950 / 73.0
62.0
69.5
69.5
63.5
58.5
68.5
64.0
67.5 / 79.0
74.0
78.0
73.5
70.0
73.5
81.0
69.5
77.0 / ± 7
± 9
± 8
± 9
± 10
± 9
± 7
± 9
± 7
Performance IQ (PIQ)
Prorated
1.PC + MR + DSC + SS
1b.PC + MR + DSC
Deviation Quotients
1.PC + MR + DSC + SS
1b.PC + MR + DSC / .94
.93
.92
.93
.92 / .950
.960
.950
.959 / .903
.913
.904
.913 / 59.5
79.0
67.0
80.5 / 77.0
84.5
75.0
85.5 / ± 10
± 9
± 10
± 8
Full-Scale IQ (FIQ)
Prorated
1.VIQ1 + PIQ1
1b.VIQ1 + PIQ1b
2.VIQ2 + PIQ1
2b.VIQ2b + PIQ1b
3.VIQ3 + PIQ1
3b.VIQ3 + PIQ1b
4.VIQ4 + PIQ1
4b.VIQ4b + PIQ1b
Deviation Quotients
1.VIQ1 + PIQ1
1b.VIQ1 + PIQ1b
2.VIQ2 + PIQ1
2b.VIQ2b + PIQ1b / .98
.97
.97
.97
.97
.97
.96
.97
.96
.97
.97
.97
.96 / .976
.980
.970
.977
.977
.981
.972
.977
.976
.982
.970
.978 / .958
.962
.954
.961
.953
.957
.951
.956
.958
.964
.949
.957 / 59.5
68.0
57.0
58.5
56.0
63.0
52.0
54.5
56.0
68.5
49.0
63.5 / 68.0
75.5
64.0
72.0
64.5
72.0
60.5
69.5
66.0
77.0
59.0
76.0 / ± 9
± 6
± 9
± 7
± 9
± 7
± 10
± 7
± 9
± 7
± 9
± 7

Note. Voc = Vocabulary; Sim = Similarities; Ari = Arithmetic; DSp = Digit Span; Inf = Information; Com = Comprehension; LNS = Letter–Number Sequencing; PC = Picture Completion; DSC = Digit Span–Coding; BD = Block Design; MR = Matrix Reasoning; PA = Picture Arrangement; SS = Symbol Search; OA = Object Assembly. SF performance generally improves by only considering those subtests contributing to the full score (indicated by extension b); the more subtests included, the better are the estimates. rxx = reliability coefficients of full scales and SFs; rsf-fs = Pearson product–moment correlation between short-form and full-scale index score; r′sf-fs = short form–full scale validity coefficient corrected for redundant error variance; % within CI 90% and CI 95% = percentage of sample with SF scores within a 90% and 95% confidence interval, respectively, of the full-scale score; bandwidth for 90% = deviation from the full score in IQ points within which 90% of the sample SF scores fall. Remaining abbreviations are as defined in Table 2. Values in boldface represent those for the subtest pairs contributing to the final prorated and deviation quotient SF8s.