Table 8 Long term memory: Hedge’s g effect sizes for each test, in descending order.

From: Systematic review and meta-analysis of cognitive impairment in myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS)

Test name

N studies

N CFS

N controls

Hedges'g

S.E

95% CI

p value

Q

p

I2 (%)

Study references

Episodic

Verbal modality

California verbal learning test T score List A (Trials 1–5)

7

231

214

− 0.50

0.10

− 0.691 to − 0.315

0.0001

11.29

0.08

46.86

Cockshell et al.17, De Luca et al.21,22, Fiedler et al.24, Michiels et al.39, Tiersky et al.52, Vercoulen et al.54

California verbal learning test long delay free recall

7

263

246

− 0.36

0.09

− 0.534 to − 0.184

0.0001

9.59

0.14

37.46

Cockshell et al.17, Cockshell et al. (2014), De Luca et al.21,22, Michiels et al.39, Tiersky et al.52, Vercoulen et al.54

California verbal learning test short delay free recall

7

263

246

− 0.35

0.09

− 0.527 to − 0.179

0.0001

5.73

0.45

0.00

Cockshell et al.17, Cockshell et al. (2014), De Luca et al.21,22, Michiels et al.39, Tiersky et al.52, Vercoulen et al.54

California verbal learning test long delay cued recall

4

177

173

− 0.27

0.11

− 0.483 to − 0.064

0.01

2.40

0.49

0.00

Cockshell et al.17, Cockshell et al. (2014), De Luca et al.21, Vercoulen et al.54

California verbal learning test recognition

5

197

195

− 0.26

0.10

− 0.452 to − 0.058

0.011

1.80

0.77

0.00

Cockshell et al.17, Cockshell et al. (2014), De Luca et al.21, Michiels et al.39, Vercoulen et al.54

California verbal learning test short delay cued recall

4

177

173

− 0.21

0.11

− 0.422 to − 0.004

0.045

3.37

0.34

11.11

Cockshell et al.17, Cockshell et al. (2014), De Luca et al.21, Vercoulen et al.54

Weschler logical memory 2

4

98

79

− 0.43

0.15

− 0.729 to − 0.137

0.004

1.15

0.77

0.00

Claypoole et al.15, De Luca et al.21, Grafman et al.25, Tiersky et al.52

Weschler logical memory 1

6

141

122

− 0.41

0.12

− 0.651 to − 0.166

0.001

5.98

0.31

16.43

Claypoole et al.15, De Luca et al.21, Grafman et al.25, Krupp et al.30, Short et al.49, Tiersky et al.52

Weschler verba paired associates 2

2

42

39

− 0.29

0.22

− 0.727 to 0.138

0.182

1.74

0.19

42.67

Claypoole et al.15, Grafman et al.25

Weschler verba paired associates 1

2

42

39

0.10

0.22

− 0.327 to 0.53

0.642

0.24

0.62

0.00

Claypoole et al.15, Grafman et al.25

Buschke selective reminding test

Long term retrieval

2

64

55

− 0.64

0.19

− 1.005 to − 0.274

0.001

0.05

0.82

0.00

Michiels et al.40,41

Delayed recall

3

75

73

− 0.58

0.17

− 0.908 to − 0.259

0.0001

1.13

0.57

0.00

Krupp et al.30, Marshall et al.35, Michiels et al.40

Long term storage

3

84

75

− 0.57

0.16

− 0.883 to − 0.256

0.0001

0.07

0.96

0.00

Marshall et al.35, Michiels et al.40,41

Delayed recognition

2

64

55

− 0.18

0.24

− 0.655 to 0.288

0.45

0.00

1.00

0.00

Michiels et al.40,41

Rey auditory verbal learning test

Total 8

2

52

37

− 0.80

0.22

− 1.233 to − 0.360

0.0001

0.63

0.43

0.00

Claypoole et al.15, Lawrie et al.31

Total 7

4

118

73

− 0.68

0.15

− 0.978 to − 0.373

0.0001

2.51

0.47

0.00

Claypoole et al.15, Lawrie et al.31, Neu et al.42, Robinson et al.44

Recognition

3

96

51

− 0.49

0.18

− 0.832 to − 0.139

0.006

2.79

0.25

28.30

Lawrie et al.31, Neu et al.42, Robinson et al.44

Total 6

3

88

58

− 0.41

0.17

− 0.754 to − 0.075

0.017

2.10

0.35

4.96

Claypoole et al.15, Neu et al.42, Robinson et al.44

Total 1–5

4

118

73

− 0.41

0.15

− 0.707 to − 0.113

0.007

0.99

0.80

0.00

Claypoole et al.15, Lawrie et al.31, Neu et al.42, Robinson et al.44

Visual modality

Rey Osterrieth complex figure recall 3 min (Cotation b)

3

92

71

− 0.67

0.16

− 0.979 to − 0.351

0.0001

0.17

0.92

0.00

De Luca et al.21,22, Tiersky et al.52

Rey Osterrieth complex figure recall 20 min (Cotation b)

2

62

51

− 0.64

0.19

− 1.013 to − 0.263

0.001

0.10

0.75

0.00

De Luca et al.21,22

Rey Osterrieth complex figure recall 3 min (Cotation a)

5

196

198

− 0.22

0.10

− 0.421 to − 0.027

0.026

4.28

0.37

6.56

Cockshell et al.17, Cockshell et al. (2014), Claypoole et al.15, Short et al.49, Vercoulen et al.54

Rey Osterrieth complex figure recall 20 min (Cotation a)

3

122

122

− 0.06

0.13

− 0.313 to 0.185

0.616

1.77

0.41

0.00

Cockshell et al.17, Cockshell et al. (2014), Claypoole et al.15

Spatial recogniton memory (%)

2

101

157

− 0.32

0.13

− 0.568 to − 0.066

0.013

0.46

0.50

0.00

Capuron et al.13, Majer et al.33

Pattern recognition memory (%)

2

101

157

− 0.04

0.13

− 0.286 to 0.214

0.776

1.55

0.21

35.58

Capuron et al.13, Majer et al.33

Visual reproduction 1

2

38

35

− 0.57

0.23

− 1.028 to − 0.107

0.016

0.97

0.32

0.00

Fiedler et al.24, Grafman et al.25

Visual reproduction 2

2

38

35

− 0.47

0.23

− 0.924 to − 0.008

0.046

1.38

0.24

27.52

Fiedler et al.24, Grafman et al.25

  1. ME/CFS myalgic encephalomyelitis/chronic fatigue syndrome, N number.