Cox regression analysis of event-free survival in childhood acute lymphoblastic leukemia analyzing the relative risk of established indicators of prognosis
| Variable* . | Hazards ratio . | 95% confidence intervals . | |
|---|---|---|---|
| Lower . | Upper . | ||
| Age | 0.70 | 0.15 | 3.39 |
| Immunophenotype | 0.30 | 0.49 | 1.81 |
| Gender | 2.19 | 0.71 | 6.72 |
| WBC | 4.56 | 1.29 | 16.04 |
| Variable* . | Hazards ratio . | 95% confidence intervals . | |
|---|---|---|---|
| Lower . | Upper . | ||
| Age | 0.70 | 0.15 | 3.39 |
| Immunophenotype | 0.30 | 0.49 | 1.81 |
| Gender | 2.19 | 0.71 | 6.72 |
| WBC | 4.56 | 1.29 | 16.04 |
WBC indicates white cell count.
Variables defined according to risk groups as follows: age, good risk 1 to 10 years old, poor risk < 1 and > 10 years old; immunophenotype, good-risk B lineage, poor-risk T lineage; gender, good risk girls, poor risk boys; WBC good risk < 50 × 109/L, poor risk > 50 × 109/L.