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F2 1
Appendix F2
Cognitive Profi ciency Index (CPI) Conversion Table
Table F.2 CPI Equivalents of Sums of Scaled Scores
Sum of 
Scaled 
Scores CPI 90% CI 95%CI Percentile Rank
 4 40 38–50 37–51 <0.1
 5 42 40–52 39–53 <0.1
 6 44 42–54 41–55 <0.1
 7 46 44–56 43–57 <0.1
 8 48 46–58 44–59 <0.1
 9 50 47–60 46–61 <0.1
10 52 49–61 48–63 0.1
11 54 51–63 50–64 0.1
12 56 53–65 52–66 0.2
13 58 55–67 54–68 0.3
14 60 57–69 56–70 0.4
15 62 59–71 57–72 1
16 63 60–72 58–73 1
17 65 61–74 60–75 1
18 67 63–75 62–77 1
19 68 64–76 63–77 2
20 70 66–78 65–79 2
21 71 67–79 66–80 3
22 72 68–80 67–81 3
23 73 69–81 68–82 4
24 75 71–83 70–84 5
25 76 72–84 70–85 5
(continued)
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 2 APPENDIX F2
Table F.2 (Continued)
Sum of 
Scaled 
Scores CPI 90% CI 95%CI Percentile Rank
26 77 73–85 72–86 7
27 79 74–87 73–88 8
28 80 75–87 74–89 9
29 81 76–88 75–90 10
30 83 78–90 77–91 12
31 84 79–91 78–92 14
32 86 81–93 80–94 18
33 87 82–94 81–96 20
34 89 83–95 82–97 22
35 91 86–98 84–99 28
36 93 87–99 86–100 31
37 94 88–100 87–102 34
38 96 90–102 89–104 39
39 98 92–104 91–105 44
40 100 94–106 93–107 50
41 101 95–107 94–108 53
42 102 96–108 95–109 56
43 104 98–110 97–111 62
44 106 99–111 98–112 65
45 107 101–113 100–114 69
46 109 102–114 101–116 73
47 112 105–117 104–118 79
48 113 106–118 105–120 81
49 116 108–121 107–122 85
50 117 110–122 109–123 87
51 119 112–124 111–125 90
52 121 113–125 112–126 92
53 123 115–127 114–128 93
54 125 117–129 116–130 95
55 127 119–131 118–132 96
56 129 121–133 120–134 97
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 APPENDIX F2 3
57 131 123–135 122–136 98
58 133 125–137 124–138 99
59 136 127–140 126–141 99
60 138 129–141 128–143 99
61 140 131–143 130–144 99.6
62 142 133–145 132–146 99.7
63 144 135–147 134–148 99.8
64 146 137–149 136–150 99.9
65 148 139–151 137–152 99.9
66 150 140–153 139–154 >99.9
67 152 142–154 141–156 >99.9
68 154 144–156 143–157 >99.9
69 156 146–158 145–159 >99.9
70 158 148–160 147–161 >99.9
71 160 150–162 149–163 >99.9
72 160 150–162 149–163 >99.9
73 160 150–162 149–163 >99.9
74 160 150–162 149–163 >99.9
75 160 150–162 149–163 >99.9
76 160 150–162 149–163 >99.9
Source : WISC-IV Advanced Clinical Interpretation Copyright © 2003 by NCS Pearson, Inc. Re-
produced with permission. All rights reserved. Wechsler and WISC are trademarks, in the United 
States and/or other countries, of Pearson Education, Inc. or its affi liates(s). 
Note: CI= Confi dence Interval
Sums of Scaled Scales are determined by summing the scaled scores of Digit Span, Letter-
Number Sequencing, Coding, and Symbol Search.
Appendix F2.indd 3Appendix F2.indd 3 2/13/09 4:24:30 PM2/13/09 4:24:30 PM