Report – Block Design Test This test was a custom design test based on the multiple choice version of the Block Design Test from The WISC - 5 Integrated. All options were custom des igns. The block r eference images were a combination of custom designs and from professional tests. Raw Data 58 people completed the test. 58 people submitted previous IQ results. The average score was 16.5 SD 3.7 Regressions BD vs CAIT PRI The following plot is the correlation between BD raw score and CAIT PRI. 7 individuals had not taken both CAIT subtests but had taken either the equivalent WAIS - 4 subtest OR Block Design and this was substituted to calculate the PRI. The correlation was r = 0.72 at N = 48. Descriptive Statistics N Minimum Maximum Mean Std. Deviation rawscore 58 6.00 23.00 16.4828 3.73810 caitpri 48 89.00 160.00 129.4375 16.62209 caitvp 47 9.00 23.00 14.6596 3.40892 caitfw 41 11.00 24.00 16.1220 3.28782 Valid N (listwise) 41 BD raw vs CAIT VP SS The correlation was r = 0.6 9 uncorrected N = 47. BD raw vs CAIT FW SS The correlation was r = 0.46 uncorrected N = 41. BD raw vs WAIS - 4 BD Only 8 people submitted scores for professionally administered block design as an adult. Relia bility Reliability Statistics Cronbach's Alpha N of Items .865 26 Reliability Statistics Cronbach's Alpha Part 1 Value .758 N of Items 13 a Part 2 Value .806 N of Items 13 b Total N of Items 26 Correlation Between Forms .643 Spearman - Brown Coefficient Equal Length .782 Unequal Length .782 Guttman Split - Half Coefficient .767 a. The items are: q1, q2, q3, q4, q5, q6, q7, q8, q9, q10, q11, q12, q13. b. The items are: q14, q15, q16, q17, q18, q19, q20, q21, q22, q23, q24, q25, q26. Item difficulty Question Difficulty (% correct) 1 98 2 79 3 98 4 94 5 93 6 96 7 74 8 48 9 79 10 93 11 91 12 93 13 62 14 84 15 72 16 74 17 72 18 77 19 50 20 4 6 21 42 22 32 23 32 24 28 25 16 26 16 * Note : only approximately 20 % of testees finished the test and the %s were corrected to account for number of attempts on a particular question. The 5 most highly g - loaded items on the test in order were: 8, 19, 13, 20, 17. Question 8 stood out as an excellent question; question 8 strongly sorts below and above average testees. Factor analysis The primary extracted factor w as significant (>1.0) and the test appeared to load strongly on a single factor. Normalization Block Design: 8/21/2022 Raw SS 26 24 25 23 24 22 23 21 22 20 21 19 20 18 19 1 7 18 1 6 17 1 5 16 14 15 13 14 12 13 11 12 1 0 11 10 10 9 9 8 8 7 7 6 6 5 Visuospatial Index (VSI) Add Block Design SS + CAIT Visual Puzzles SS SS PRI 45 160 44 160 43 160 42 160 41 160 40 160 39 158 38 154 37 150 36 146 35 142 34 139 33 136 32 133 31 130 30 127 29 124 28 122 27 119 26 117 25 114 24 111 23 108 22 105 21 103 20 100 19 97 18 94 17 92 16 89 15 86 14 83 13 81 12 78 11 75 10 73 9 70 8 67 7 64 6 62 5 59