Skip to main content
. 2017 Jun 16;5(2):26. doi: 10.3390/jintelligence5020026

Table A1.

Descriptive Statistics for All Study Variables (Minimum, Maximum, Mean, Standard Deviation, Skewness, Kurtosis, and Reliability).

Measures Time N Min Max M SD Skewness Kurtosis Reliability#
Nonverbal intelligence t1 189 3 82 58.98 8.80 −1.35 7.89
t2 194 44 85 68.57 7.18 −0.48 0.91
t3 193 11 42 29.44 5.65 −0.34 −0.01 0.69
t4 174 79 147 120.49 14.48 −0.15 −0.68 0.70
t5 145 18 46 39.68 4.73 −1.36 2.50 0.74
Verbal intelligence t1 207 21 64 46.36 8.41 −0.42 0.20 0.74
t2 196 11 73 35.97 13.39 0.33 −0.60 0.78
t3 192 19 102 62.09 13.94 −0.08 0.17 0.77
t4 174 9 29 19.25 4.08 −0.10 −0.76 0.76
t5 151 8 31 21.70 4.51 −0.44 −0.03 0.79
Serial word span t1 207 0 6 3.47 0.97 −1.12 3.66
t2 197 0 6 4.15 0.88 −1.03 3.52
t3 187 2 7 4.78 0.86 −0.02 0.55
Unconstrained word span t1 207 1 6 3.84 0.80 −0.21 0.08
t2 197 3 6 4.46 0.82 −0.13 −0.52
t3 187 2 7 5.28 0.90 −0.37 0.15
Total nr. of correct words (listening span) t1 207 20 211 99.39 36.99 0.47 0.13
t2 195 40 238 141.86 45.66 0.10 −1.04
t3 193 61 232 157.32 43.09 −0.09 −1.18
t4 170 68 339 226.05 53.80 0.23 −0.19
t5 151 65 340 214.35 55.57 0.10 0.13
Total nr. of correct sentences (listening span) t1 208 2 38 14.05 6.63 0.69 0.69 0.83
t2 195 5 56 21.56 8.58 0.48 0.15 0.85
t3 193 6 40 24.83 8.14 0.02 −0.99 0.84
t4 170 9 61 38.09 9.72 0.20 0.06 0.98
t5 151 7 59 36.54 10.21 0.07 0.22 0.98
Word decoding speed t2 186 2 9 4.29 1.51 1.22 1.26 0.83
Text comprehension (Moon) t5 150 11 48 34.53 8.07 −0.71 −0.01 0.69
Text comprehension (Duchess) t5 150 0 7 4.70 1.76 −0.34 −0.84 0.66
Spelling t2 194 2 18 11.20 4.01 −0.46 −0.59 0.84
t3 192 17 60 49.81 8.22 −1.29 1.67 0.89
t4 174 15 62 46.04 8.10 −0.53 0.53 0.86
t5 151 15 63 46.98 7.92 −1.09 2.00 0.88
Standard mathematical problems t2 157 10 26 20.75 3.54 −0.81 0.23
Reasoning mathematical problems t2 157 5 18 12.80 2.83 −0.54 −0.18
Mathematical relation task 1 t3 193 0 6 3.24 2.16 0.04 −1.62 0.82
Mathematical relation task 2 t3 193 0 6 3.56 2.13 −0.21 −1.61 0.82
Word problems t3 193 0 4 2.03 1.01 −0.36 −0.62
Numerical problems t4 173 0 6 1.55 1.18 0.70 0.43 0.54
Word problems t4 174 0 9 3.25 1.80 0.81 0.57 0.64

# Note: Reliabilities (Cronbach’s alpha) in this table are based on data in the LOGIC study (e.g., subscale or item level) and thus differ from those reported in the text. For nonverbal intelligence at t1 and t2, mathematical problems at t2 and word problems at t3, and for working memory, only sum scores were available in the data of the LOGIC study. For the total scores of working memory t1 to t5, reliabilities (Cronbach’s alpha) are provided in the rows of the listening span for sentences based on the combination of all sum scores of working memory tasks (listening span (words and sentences) and serial and unconstrained word span).