Fig. 3.
Forest plot outlining the results of previous studies investigating iron deficiency in RLS with MRI for the substantia nigra and the caudate. The diamonds indicate the pooled effects estimated by the random-effects models. Mean and standard deviation for studies marked as (R2) were estimated from reported T2 values using the relation R2 = 1/T2. Note: Li. et al. have corrected their results for either age or volume, but did not indicate which was used specifically for each region. Ne: number of samples in RLS group, Nc: number of samples in the healthy control group, SMD: Standardized Mean Difference.