Fig. 1
From: Thorium and fetal neural tube defects: an epidemiological evidence from large case-control study
Comparison of hair thorium concentration (Conc.) among the participants with the exposure indices of 0, 1, and 2. The statistical difference between groups were determined by Mann-Whitney U test, * P < 0.001. The overall trend was tested by Logistic regression model, # P < 0.001. Data are shown as lower limit value, 25% percentile (P25), median value, 75% percentile (P75), and upper limit value, respectively