Fig. 2

Forest plot for serum acylcarnitine levels between the ME/CFS/SEID patient group and the control group. The ME/CFS/SEID patient group had significantly lower serum acylcarnitine levels when compared with the control group (Δ = − 0.69; [95% CI − 1.09, − 0.30]), with a high heterogeneity. ME myalgic encephalomyelitis, CFS chronic fatigue syndrome, SEID systemic exertion intolerance disease, CI confidence interval, N number, SD standard deviation