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Table 1 Characteristics of the study population

From: Henoch-Schönlein purpura and drug and vaccine use in childhood: a case-control study

  Cases Controlsa  
Number 288 617  
Median age (range) 6y (2 m–18y) 3y (1 m–18y) p < 0.001
% Females 48 45 p = 0.8
Median length of hospital stay (range, days) 4 (1–31) 3 (1–37) p < 0.001
Median interval from drug/vaccine to symptom onset (range, days) 2 (0–60) 0 (0–90) p < 0.001
Children exposed to drugs: N (%) 175 (61) 435 (71) p < 0.08
Children exposed to vaccines: N (%) 21 (7) 68 (11) p = 0.08
  1. agastroduodenal lesions