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Table 2 Study 2 feasibility, test-retest reliability, and examination of practice effects

From: The NIH Toolbox Cognitive Battery for intellectual disabilities: three preliminary studies and future directions

 

Feasibility (% of n = 50 valid)

Number (test-retest)

Visit 1, mean (SD)

Visit 2, mean (SD)

t

p

Cohen’s d

ICC

DCCS

84

17

3.32 (2.35)

3.89 (2.27)

−1.51

.15

.13

.88

Flanker

82

17

4.44 (1.98)

4.33 (2.33)

0.23

.82

.23

.75

List sorting

66

14

9.36 (4.31)

8.00 (4.47)

−1.56

.14

.31

.84

Oral reading

90

17

−3.94 (3.18)

−3.88 (3.31)

0.71

.49

.03

.99

Pattern comparison

90

16

29.53 (13.47)

35.35 (12.86)

2.08

.01

.44

.90

Picture sequence memory

78

17

−1.39 (0.72)

−1.12 (1.05)

1.45

.18

.46

.76

Picture vocabulary

92

17

−2.50 (2.13)

−3.05 (1.94)

−1.27

.22

.27

.77

  1. Test-retest reliability measured by intraclass correlation (ICC). Practice effects measured by paired samples t tests. Effect size of difference measured by Cohen’s d