Figure 2. Kaplan-Meier survival analysis of severely paraquat-poisoned patients that received early hemoperfusion (<4 h; n = 13, 7/13 = 53.8%) and those that received late hemoperfusion (≥4 h; n = 194; 65/194 = 29.9%).

Log-rank tests, Chi-square = 4.17; P = 0.041.