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Table 7 Distributional characteristics of the predictor and outcome variables across 201 participants

From: Interference scores have inadequate concurrent and convergent validity: Should we stop using the flanker, Simon, and spatial Stroop tasks?

Variable

Min

Max

Mean (SD)

Skew (SE)

Kurtosis (SE)

Raven’s scores

2

12

8.4 (2.3)

−.56 (.17)

−.21 (.34)

Teams sports ability

1

5

2.7 (1.1)

+.01 (.17)

−.75 (.34)

Frequency of physical exercise

1

5

3.2 (1.0)

−.11 (.17)

−.41 (.34)

Years of musical training

0

32

2.7 (4.3)

3.1 (.17)

13.9 (.34)

Frequency of playing an instrument

1

5

1.8 (1.0)

1.3 (.17)

1.37 (.34)

Frequency of playing video games

1

5

2.2 (1.1)

.78 (.17)

.03 (.34)

Frequency of meditation or mindfulness

1

5

2.4 (1.0)

+.43 (.17)

−.42 (.34)

L2/L1 ratio

0

1

.53 (.37)

−.34 (.17)

−1.38 (.34)

SES (parents’ education & family income)

1.3

7.3

4.4 (1.3)

−.05 (.17)

−.63 (.34)

(Lack of) Premeditation

1.8

4.0

3.1 (0.4)

−.18 (.17)

+.09 (.34)

Urgency

1.2

3.9

2.3 (0.5)

+.11 (.17)

+.17 (.34)

(Lack of) Perseverance

2.1

3.9

2.9 (0.3)

−.00 (.17)

−.08 (.34)

Self-Control (BSCS)

1.8

4.8

3.3 (0.6)

+.03 (.17)

−.17 (.34)

Z Composite RT across four tasks

−1.3

2.5

0 (.65)

.84 (.17)

1.03 (.34)