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. Author manuscript; available in PMC: 2017 Jan 1.
Published in final edited form as: Learn Individ Differ. 2016 Jan 1;45:299–306. doi: 10.1016/j.lindif.2015.12.022

Table 1.

Descriptive Statistics: Independent and Dependent Variables

Variable Mean Range Standard Deviation
IBQ-R (4 months of age)
 Positive Affectivity/Surgency (PAS)
−.77 −8.75 – 7.23 4.02
 Negative Emotionality (NE)
−.78 −5.14 – 6.58 2.57
 Regulatory Capacity/Orienting (RCO)
.22 −5.27 – 4.44 .92

Variable Mean Range S.D.

Lab-TAB (12 months of age)
 Positive Affectivity/Surgency (PAS)
.00 −3.29 – 5.89 2.56
 Negative Emotionality (NE)
17.00 −4.80 – 7.97 3.29
 Regulatory Capacity/Orienting (RCO)
−.02 −5.23 – 5.70 2.13
BBCS (3–5 years of age)
 Color
10.00 6.00 – 11.00 1.41
 Letter
10.41 1.00 – 16.00 5.12
 Number
9.86 .00 – 19.00 6.97
 Size
8.10 2.00 – 12.00 2.92
 Comparison
4.17 .00 – 9.00 2.82
 Shape
12.34 5.00 – 19.00 3.66
 School Readiness Composite
118.55 85.00 – 148.00 16.17