TABLE 1.
Subject Demographics and HSP Characteristics
| Index HSP Admissions (N = 1895) | |
|---|---|
| Demographic | |
| Age, median (interquartile range), y | 6 (4–8) |
| Male, n (%) | 1119 (59) |
| Race, n (%) | |
| White | 1481 (78) |
| Black | 139 (7) |
| Asian | 62 (3) |
| American Indian | 12 (1) |
| Other/Unknown | 201 (11) |
| Medicaid, n (%) | 611 (32) |
| Length of stay, median (interquartile range), d | 3 (2–5) |
| Primary admission ICD-9-CM code, n (%)a | |
| HSP | 727 (38) |
| Abdominal pain/vomiting/diarrhea | 352 (19) |
| Gastrointestinal bleeding | 58 (3) |
| Arthritis or arthralgias | 41 (2) |
| Infection | 40 (2) |
| Hematuria or proteinuria | 39 (2) |
| Nephrotic syndrome/nephritis | 37 (2) |
| Intussusception | 26 (1) |
| Purpura, not otherwise specified | 22 (1) |
| Acute renal failure | 8 (<1) |
| Hypertension | 9 (<1) |
| Other | 536 (28) |
| Discharge ICD-9-CM code, n (%)b | |
| HSP | 1895 (100) |
| Abdominal pain | 395 (21) |
| Nephrotic syndrome/nephritis | 160 (8) |
| Gastrointestinal bleeding | 148 (8) |
| Hypertension | 135 (7) |
| Hematuria or proteinuria | 156 (8) |
| Intussusception | 66 (4) |
| Arthritis or arthralgias | 81 (4) |
| Acute renal failure | 34 (2) |
a
Mutually exclusive (only 1 admission diagnosis is assigned per subject).
b
Not mutually exclusive.