Fig. 1
From: Early life blood lead levels and asthma diagnosis at age 4–6 years
Distributions of blood lead concentrations for children with and without a reported asthma diagnosis (Dx) through 72 months of age. The outer limits of the boxes (top to bottom) represent the 75th and 25th percentiles; the horizontal bars within the boxes represent the 50th percentiles, and the triangles represent the means. The whiskers indicate 90th and 10th percentiles; observations outside of the 90th and 10th percentiles are represented as points