Figure 2

Illness characteristics in early- (≤21 years) compared to later-onset patients in Argentina and the United States. (A) Illness characteristics by onset age among patients in Argentina. (B) Illness characteristics by onset age among patients in the United States. *p < 0.05; **p < 0.01; ***p < 0.001; ****p < 0.0001 for onset age ≤21 versus >21 years.