Fig. 3

Forest map for the meta-analysis, grouped by history of lead exposure. (a) High lead exposure. (b) Moderate lead exposure. (c) Low lead exposure. (d) Controls. (e) Uygur population group. (f) Han population group. (g) Non-Hispanic Whites. (h) Non-Hispanic Blacks. (i) Mexican Americans. (j) Amyotrophic lateral sclerosis (ALS) patients. (k) Individuals without ALS. CI: confidence interval, DL: DerSimonian‒Laird.