Table 9 Executive functions: 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

Planning

Stockings of Cambridge

2

101

157

− 0.14

0.13

− 0.390 to 0.109

0.271

0.21

0.65

0.00

Capuron et al.13, Majer et al.33

Flexibility

TMT B

8

255

205

0.42

0.10

0.230–0.603

0.0001

5.06

0.65

0.00

Claypoole et al.15, De Luca et al.21, Krupp et al.30, Lawrie et al.31, Michiels et al.40, Michiels et al.39, Robinson et al.44, Vercoulen et al.54

TMT B-A

2

102

73

0.10

0.16

− 0.209 to 0.403

0.536

0.26

0.61

0.00

Robinson et al.44, Vercoulen et al.54

Inhibition

Stroop

Interference (corrects)

2

51

61

− 0.51

0.19

− 0.885 to − 0.136

0.008

0.97

0.33

0.00

Beaumont11, Di Clementi et al.57

Interference (s) Cotation 2

2

78

40

0.40

0.20

0.004 to 0.788

0.048

0.42

0.52

0.00

Mahurin et al.32, Smith et al.51

Interference (s) Cotation 1

3

124

124

0.41

0.13

0.159 to 0.657

0.001

0.00

1.00

0.00

Cockshell et al.17, Cockshell et al. (2014), Ray et al.60

Generation of information

FAS fluencies

5

180

130

− 0.37

0.12

− 0.603 to − 0.142

0.002

7.73

0.10

48.27

Cockshell et al.17, Joyce et al.29, Lawrie et al.31, Marcel et al.34, Robinson et al.44

Category fluencies

3

99

95

− 0.35

0.14

− 0.635 to − 0.072

0.014

2.47

0.29

19.15

Cockshell et al.17, Joyce et al.29, Marcel et al.34

Controlled oral word

2

42

42

− 0.02

0.22

− 0.448 to 0.406

0.922

5.77

0.02

82.68

Claypoole et al.15, Krupp et al.30

Abstraction

WAIS-R similarities

2

34

33

0.04

0.24

− 0.425 to 0.510

0.86

0.06

0.80

0.00

Claypoole et al.15, DeLuca et al.20

  1. TMT trail making test, WAIS Wechsler adult intelligence scale, ME/CFS myalgic encephalomyelitis/chronic fatigue syndrome, N number.