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Table 2 Results of practice effect and test–retest reliability (n = 56)

From: Practice effect and test–retest reliability of the Wechsler Memory Scale-Fourth Edition in people with dementia

Index/subtest

Mean1 (SD1)

Mean2 (SD2)

Cohen’s d

Mean practice effect

(p value)

ICC (95% CI)

SEM

SEdiff

RCIp with 95% CI

Index

  VMI

55.5 (12.5)

58.5 (14.2)

0.23

3.0 (0.520)

0.82 (0.68, 0.89)

5.3

7.5

-11.7, 17.8

  DMI

49.7 (8.4)

50.8 (8.4)

0.12

1.0 (0.088)

0.85 (0.75, 0.91)

3.3

4.7

-8.1, 10.2

Subtest

  LM I

2.5 (1.8)

2.8 (2.4)

0.15

0.3 (0.175)

0.73 (0.58, 0.83)

0.9

1.3

-2.3, 3.0

  VPA I

1.7 (1.8)

1.8 (1.8)

0.03

0.1 (0.281)

0.72 (0.55, 0.82)

0.9

1.3

-2.6, 2.7

  VPA II

1.9 (1.5)

1.9 (1.4)

0.01

0.0 (0.893)

0.78 (0.65, 0.87)

0.7

1.0

-1.9, 1.9

  VR II

2.6 (1.2)

2.6 (1.2)

0.00

0.0 (-)

1.00 (1.00, 1.00)

0.0

0.0

0.0, 0.0

  SSP

3.5 (2.1)

4.1 (2.6)

0.29

0.7 (0.370)

0.57 (0.36, 0.73)

1.4

2.0

-3.2, 4.6

  1. VMI visual memory, DMI delayed memory, LM I logical memory immediate recall, VPA I verbal paired associates immediate recall, VPA II verbal paired associates delayed recall, VR II visual reproduction delayed recall, SSP symbol span, SD standard deviation, ICC intraclass correlation coefficient, CI confidence interval, SEM standard error of measurement, SEdiff, standard error of the differences, RCIp reliable change index modified for practice