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. 2022 Feb 9;12:2157. doi: 10.1038/s41598-021-04764-w

Table 2.

Intellectual efficiency: Hedge’s g effect sizes for each test, in descending order.

Test name N studies N CFS N controls Hedges'g S.E 95% CI p value Q p I2 (%) Study references
Verbal
National adult reading test 7 210 164 − 0.07 0.11 − 0.272 to 0.140 0.533 7.35 0.29 18.40 Cockshell et al.17, Di Clementi et al.57, Fiedler et al.24, Joyce et al.29, Lawrie et al.31, Marshall et al.35, Robinson et al.44
WAIS-R Verbal 2 34 33 − 0.10 0.24 − 0.571 to 0.364 0.664 0.03 0.86 0.00 Claypoole et al.15, DeLuca et al.20
Non-verbal
Standard progressive matrices 3 84 77 − 0.17 0.16 − 0.476 to 0.136 0.276 0.50 0.78 0.00 Michiels et al.39,40,41

WAIS Wechsler adult intelligence scale, ME/CFS myalgic encephalomyelitis/chronic fatigue syndrome, N number.