Demographic details for trial patients and patients with missing data
| Patients with confirmed osteonecrosis (%) | Patients with no questionnaire response (%) | All trial patients | |
| Age (years) at diagnosis of ALL | |||
| <10 | 22 (1.0) | 3 (0.1) | 2279 |
| 10–15 | 111 (18.3) | 10 (1.6) | 607 |
| 16+ | 35 (15.4) | 16 (7.0) | 227 |
| Ethnicity | |||
| White | 141 (5.6) | 25 (1.0) | 2525 |
| Asian | 15 (6.5) | 2 (0.9) | 74 |
| Black | 3 (4.0) | 1 (1.3) | 232 |
| Other | 11 (7.2) | 1 (0.7) | 164 |
| Unknown/missing | 0 | 0 | 118 |
| Gender | |||
| Male | 96 (5.4) | 19 (1.1) | 1767 |
| Female | 74 (5.5) | 10 (0.7) | 1346 |
ALL, acute lymphoblastic leukaemia.