Table 1. Comparison of characteristics between patients with acute and chronic ITP.
| Characteristic | Acute ITP (n=55) | Chronic ITP (n=9) | P value |
|---|---|---|---|
| Age at diagnosis (mo) | 0.02 | ||
| Median (range) | 13 (1–186) | 71 (2–124) | |
| Mean±SD | 34±45 | 69±37 | |
| Sex | |||
| Male:female | 33 (60.0):22 (40.0) | 5 (55.5):4 (44.4) | |
| Antecedent infection | 38 (69.1) | 1 (11.1) | <0.01 |
| Recent vaccination | 8 (14.5) | 1 (11.1) | 0.63 |
| Abrupt onset | 36/39 (92.3) | 4/9 (44.4) | <0.01 |
| Initial platelet count (×109/L) | |||
| Median (range) | 10 (0–84) | 9 (1–58) | |
| Mean±SD | 25±27 | 14±17 | |
| Bleeding manifestation | 0.10 | ||
| No | 15/54 | 0 | |
| Mild | 32/54 | 6 | |
| Moderate | 7/54 | 3 | |
| Severe | 0/54 | 0 | |
| No. of patients with platelet count ≥45×109/L* | 32/36 (88.8) | 4/9 (44.4) | <0.01 |
Values are presented as number (%) unless otherwise indicated.
ITP, immune thrombocytopenia; SD, standard deviation.
*1 month after treatment.