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Table 3 T-scores (M = 50, SD = 10) on formal neuropsychological tests

From: The neuropsychological phenotype of Chediak-Higashi disease

  n Mean (SD) Percent scoring in bottom 16th percentile of population Percent scoring in bottom 2.3 percentile of population
General Intelligence
Wechsler FSIQa 12 32.9 (8.1) 67% 42%
WRAT-4 Word Readinga 12 40.1 (8.7) 42% 17%
WRAT-4 Spellinga 8 44.3 (9.5) 38% 13%
WRAT-4 Math Computationa 9 33.2 (6.0) 100% 22%
Executive Function
WCST Total Errorsa 9 30.6 (8.6) 100% 44%
WCST Perseverative Responsesa 9 34.6 (8.8) 56% 22%
Attention/Working Memory
WAIS-III Digit Spana 13 45.9 (7.7) 15% 0%
WAIS-III Letter-Number Sequencinga 10 40.1 (7.0) 40% 0%
CPT-II Omissionsb 9 19.0 (19.5) 78% 78%
CPT-II Commissionsb 9 42.7 (8.4) 22% 11%
CPT-II Reaction Timeb 9 38.3 (9.5) 67% 11%
CPT-II Reaction Time Standard Errorb 9 29.2 (15.6) 78% 56%
Processing Speed
WAIS-III Digit-Symbol Codinga 13 31.5 (6.2) 86% 38%
WAIS-III Symbol Searcha 13 36.9 (5.2) 54% 0%
Language Fluency
COWA FASc 8 36.8 (7.0) 67% 13%
COWA Animalsc 8 35.0 (8.3) 50% 38%
Learning and Memory
NAB Memory Indexa 12 26.4 (12.3) 83% 75%
BVMT-R Learninga 5 23.2 (7.7) 100% 80%
BVMT-R Memorya 5 25.2 (10.1) 80% 80%
HVLT-R Learninga 7 25.1 (8.1) 86% 86%
HVLT-R Memorya 7 28.4 (9.0) 71% 57%
Psychomotor Speed
Grooved Pegboard (dominant)c 8 16.4 (9.3) 100% 100%
Grooved Pegboard (nondominant)c 8 15.4 (9.8) 100% 100%
  1. a T-score demographically corrected for age only
  2. b T-score demographically corrected for age and gender
  3. c T-score demographically corrected for age, education, race, and gender
  4. FSIQ scores were linearly transformed from standard scores to T-scores based on the normal distribution. T-scores on the CPT-II were scored so that lower T-score reflect greater inattention (i.e., scoring program-derived output was transformed via the formula 50 - (score-50))