Fig. 1

Temporal, and spatial distribution of patients receiving whole blood lead (Pb) test. a Blood Pb frequency distribution among all the patients. b Patients’ Pb distribution test with Q-Q plot. c Amount of data as well as blood Pb concentrations from 2013 to 2017. The red lines indicate the median of blood Pb levels at each year. Bar chart depict the sample size converting from 2013. c and d Sample size (c), and blood Pb concentrations (d) indicated with heating map of patients receiving Pb test born in each region in China. e and f Sample size (e), and blood Pb concentrations (f) of patients receiving Pb test worked in each region in China. Color corresponds to number of patients (c, e), or Pb levels expressed with μg/L (d, f)