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| Characteristic | Number (percentage) |
| Clinical manifestation | |
| skin rash | 1232 (100.00%) |
| Abdominal pain | 739 (59.98%) |
| Joint pain | 690 (56.01%) |
| hemafecia | 419 (34.01%) |
| hematuresis | 296 (24.03%) |
| proteinuria | 222 (180.02%) |
| The number of clinical symptoms | |
| 2 kinds | 476 (38.63%) |
| 3 kinds | 440 (35.71%) |
| 4 kinds | 224 (18.18%) |
| 5 kinds | 76 (6.17%) |
| 6 kinds | 16 (1.31%) |
