Table 1. Socio-demographic and clinical distribution of the study population.
| Variable | N (% of total) |
|---|---|
|
Sex | |
| Female | 442 (44) |
| Male |
565 (56) |
|
Age at diagnosis (years) | |
| 0–1 | 139 (14) |
| 2–4 | 386 (38) |
| 5–9 | 283 (28) |
| 10–14 |
199 (20) |
|
Calendar period of diagnosis | |
| 1968–1977 | 262 (26) |
| 1978–1987 | 231 (23) |
| 1988–1997 | 237 (24) |
| 1998–2010 |
277 (27) |
|
Paternal social class | |
| I/II | 170 (17) |
| IIIN/M | 467 (46) |
| IV/V | 189 (19) |
| Unknown |
181 (18) |
|
White blood cell count per mm3 | |
| <50 000 cells | 86 (8) |
| >50 000 cells | 701 (70) |
| Missing data |
220 (22) |
|
Diagnostic type | |
| Acute lymphoblastic leukaemia | 823 (82) |
| Acute non-lymphocytic leukaemia | 144 (14) |
| Chronic myeloid leukemia | 17 (2) |
| Others specified | 11 (1) |
| Unspecified |
12 (1) |
| Total | 1007 |