Fig. 2
Fixed-effect inverse- variance model meta-analysis forest plot of studies investigating UFC in ME/CFS patients and HC. Significance is measured at a 95% confidence interval (p ≤ 0.05). z test, p- value = 0.00. Heterogeneity (I2) = 90.13% (test of θi shows p = 0.00). CI confidence interval, H heterogeneity, ME/CFS myalgic encephalomyelitis/chronic fatigue syndrome; n number, SD standard deviation, UFC urinary free cortisol