Occurrence of Henoch–Schönlein purpura nephritis by age at onset
| Age group (years) | All | Nephritis | No nephritis |
|---|---|---|---|
| 0–3 | 19 | 5 (26%) | 14 (74%) |
| 3–6 | 88 | 32 (36%) | 56 (64%) |
| 6–10 | 70 | 34 (49%) | 36 (51%) |
| 10–16 | 46 | 31 (67%) | 15 (33%) |
| All | 223 | 102 (46%) | 121 (54%) |
p<0.001 for χ2 test for linear trend.