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Table 4 Transformation of VLT-I subtest scores

From: The screen for cognitive impairment in psychiatry: diagnostic-specific standardization in psychiatric ill patients

< Secondary school ≥ Secondary school
18-39 40-55 18-39 40-55
PD P z T IQ PD P z T IQ PD P z T IQ PD P z T IQ
0-11 < 3 < −1.72 < 33 < 74 0-9 1 < −2.19 < 28 < 67 0-5 1 < −3.45 < 16 < 48 0-9 1 < −2.4 < 26 < 64
0-11 < 3 < −1.72 < 33 < 74 0-9 1 < −2.19 < 28 < 67 6 1 −3.45 16 48 0-9 1 < −2.4 < 26 < 64
0-11 < 3 < −1.72 < 33 < 74 0-9 1 < −2.19 < 28 < 67 7 1 −3.21 18 52 0-9 1 < −2.4 < 26 < 64
0-11 < 3 < −1.72 < 33 < 74 9 1 −2.19 28 67 8 1 −2.96 20 56 0-9 1 < −2.4 < 26 < 64
0-11 < 3 < −1.72 < 33 < 74 10 2 −1.93 31 71 9 1 −2.72 23 59 10 1 −2.4 26 64
0-11 < 3 < −1.72 < 33 < 74 11 5 −1.67 33 75 10 1 −2.48 25 63 11 2 −2.14 29 68
12 3 −1.72 33 74 12 9 −1.41 36 79 11 3 −2.24 28 66 12 3 −1.89 31 72
13 9 −1.45 35 78 13 15 −1.15 39 83 12 4 −1.99 30 70 13 5 −1.63 34 76
14 13 −1.18 38 82 14 22 −0.89 41 87 13 5 −1.75 33 74 14 9 −1.37 36 79
15 19 −0.9 41 86 15 28 −0.62 44 91 14 8 −1.51 35 77 15 15 −1.12 39 83
16 30 −0.63 44 91 16 33 −0.36 46 95 15 10 −1.26 37 81 16 22 −0.86 41 87
17 43 −0.36 46 95 17 44 −0.10 49 98 16 14 −1.02 40 85 17 28 −0.61 44 91
18 51 −0.08 49 99 18 56 0.16 52 102 17 19 −0.78 42 88 18 36 −0.35 46 95
19 57 0.19 52 103 19 64 0.42 54 106 18 26 −0.54 45 92 19 46 −0.10 49 99
20 63 0.46 55 107 20 72 0.68 57 110 19 37 −0.29 47 96 20 54 0.16 52 102
21 70 0.73 57 111 21 81 0.94 59 114 20 47 −0.05 49 99 21 61 0.41 54 106
22 80 1.01 60 115 22 89 1.20 62 118 21 56 0.19 52 103 22 73 0.67 57 110
23 88 1.28 63 119 23 94 1.47 65 122 22 66 0.43 54 107 23 82 0.93 59 114
24 94 1.55 66 123 24 97 1.73 67 126 23 75 0.68 57 110 24 88 1.18 62 118
25 98 1.83 68 127 25 98 1.99 70 130 24 82 0.92 59 114 25 94 1.44 64 122
26-30 99 > 1.83 > 68 > 127 26 99 2.25 72 134 25 87 1.16 62 117 26 96 1.69 67 125
26-30 99 > 1.83 > 68 > 127 27 99 2.51 75 138 26 93 1.41 64 121 27 98 1.95 69 129
26-30 99 > 1.83 > 68 > 127 28-39 99 > 2.51 > 75 > 138 27 97 1.65 66 125 28 99 2.20 72 133
26-30 99 > 1.83 > 68 > 127 28-39 99 > 2.51 > 75 > 138 28 98 1.89 69 128 29 99 2.46 75 137
26-30 99 > 1.83 > 68 > 127 28-39 99 > 2.51 > 75 > 138 29 99 2.13 71 132 30 99 > 2.46 > 75 > 137
26-30 99 > 1.83 > 68 > 127 28-39 99 > 2.51 > 75 > 138 30 99 2.38 74 136 30 99 > 2.46 > 75 > 137
N 64 N 109 N 204 N 137
Mean 18.31 Mean 17.39 Mean 20.21 Mean 19.38
SD 3.660 SD 3.829 SD 4.120 SD 3.913
Median 18 Median 17 Median 20 Median 19
Skewness 0.048 Skewness −0.045 Skewness −0.378 Skewness −0.125
Kurtosis −1,023 Kurtosis −0.456 Kurtosis 0.340 Kurtosis −0.380
Range 12-25 Range 9-27 Range 6-30 Range 10-29