Skip to main content
. Author manuscript; available in PMC: 2020 Dec 1.
Published in final edited form as: J Exp Psychol Gen. 2019 Mar 21;148(12):2104–2119. doi: 10.1037/xge0000589

Table 2.

Descriptive Statistics

Task N M SD Range Skewness Kurtosis
Age 17 (CLTS)
Stroop 759 213.60 90.11 0, 488 0.58 0.19
Antisaccadea 779 1.04 0.20 .47, 1.57 −0.12 −0.26
Stop Signal 741 281.92 62.56 151, 489 1.13 1.51
Keep Tracka 774 0.94 0.18 .38, 1.49 0.30 0.56
Letter Memorya 785 1.09 0.25 .38, 1.57 0.29 −0.20
n-backa 777 1.17 0.17 .65, 1.57 −0.92 1.65
Number-Letter 776 330.80 183.18 −14, 923 1.04 1.12
Color-Shape 768 331.18 189.42 −196, 916 0.76 0.75
Category Switch 766 333.27 181.38 −34, 899 0.98 0.92
Phonemic S-P 811 8.39 3.90 0, 21 0.33 −0.15
Phonemic G-T 811 5.71 2.31 1, 14 0.50 −0.04
Semantic Round 811 13.50 4.90 2, 36 0.61 0.59
Semantic Metal 811 14.67 5.98 2, 35 0.35 −0.24
Vocabulary Part 1 807 24.39 8.43 1, 49 0.47 0.10
Vocabulary Part 2 808 5.83 2.95 0, 24 1.20 3.86
Performance IQb 813 101.01 11.17 72, 136 0.20 −0.11
Age 56 (VETSA)
Stroopc 1255 35.95 8.33 6, 69 0.05 0.30
AX-CPTa 1190 0.99 0.37 0, 1.39 −1.35 1.06
Trail Making Testc 1271 89.15 35.05 31.34, 240.00 1.68 3.87
Letter-Number 1280 10.13 2.36 0, 20 0.22 1.02
Reading Span 1248 34.14 5.33 15, 45 −0.54 0.05
Digit Span 1276 17.11 3.90 8, 30 0.29 −0.31
Phonemic F 1277 12.28 4.09 1, 29 0.29 −0.02
Phonemic A 1277 11.15 3.90 1, 29 0.41 0.34
Phonemic S 1277 13.48 4.32 1, 31 0.25 0.08
Animals 1275 19.20 4.43 6, 39 0.26 0.26
Boys’ Names 1276 19.09 4.48 6, 40 0.34 0.58
Fruits/Furniture 1277 12.75 2.55 4, 22 −0.01 0.30
WASI - Vocabulary 1284 54.77 8.25 21, 72 −0.62 0.67
AFQT – Vocabularyd 1203 83.05 17.82 1, 99 −1.72 2.73
WASI - Matrix Reasoning 1288 54.62 8.97 21, 72 −1.20 1.23
AFQT – Nonverbald 1288 58.91 20.86 4, 93 −0.27 −0.66

Note: In all analyses, dependent measures were standardized residual scores after adjusting for age (and sex for the adolescent sample only), but the unadjusted scores are presented here. Reaction time-based measures are also displayed before multiplying by negative 1 in all analyses (so higher scores always indicates better performance).

a

indicates the dependent measure was arcsine-transformed.

b

indicates the dependent measure was a scaled score.

c

indicates performance on the EF condition before being adjusted for performance on baseline trials (color and word trials for Stroop, number only or letter only for Trail Making Test).

d

indicates the dependent measure was a percentile score. AX-CPT = AX – Continuous Performance Test; WASI = Wechsler Abbreviated Scale of Intelligence; AFQT = Armed Forced Qualification Test.