Sample description for the cases and controls
| Cases (%) (n = 280) | Controls (%) (n = 288) | p Value | |
|---|---|---|---|
| NS, p>0.05. | |||
| *p<0.01. | |||
| †Socioprofessional categories: best occupational activity of child’s mother or father. | |||
| Diagnostic categories | |||
| Acute lymphoblastic leukaemia | 240 (86) | – | |
| Acute non-lymphoblastic leukaemia | 40 (14) | – | |
| Injury (fractures, wounds, burns, etc) | – | 154 (54) | |
| Osteoarticular diseases (osteomyelitis, arthritis, etc) | – | 100 (35) | |
| Gastrointestinal, genitourinary | – | 17 (6) | |
| Minor congenital disorders | – | 6 (2) | |
| Other | – | 11 (4) | |
| Gender | NS | ||
| Male | 166 (59) | 168 (58) | |
| Age (years) | * | ||
| <2 | 33 (12) | 51 (18) | |
| 2–3 | 85 (30) | 53 (18) | |
| 4–6 | 83 (30) | 79 (27) | |
| 7–10 | 41 (15) | 63 (22) | |
| ⩾11 | 38 (14) | 42 (15) | |
| Hospital | NS | ||
| Lille | 39 (14) | 26 (9) | |
| Lyon | 36 (13) | 35 (12) | |
| Nancy | 23 (8) | 22 (8) | |
| Paris | 182 (65) | 205 (71) | |
| Ethnic origin | NS | ||
| White | 244 (87) | 236 (82) | |
| North African | 15 (5) | 25 (9) | |
| Caribbean | 4 (1) | 5 (2) | |
| African | 2 (1) | 6 (2) | |
| Asian, Middle Eastern | 2 (1) | 6 (2) | |
| Mixed, other | 13 (5) | 10 (3) | |
| Maternal education | NS | ||
| ⩽ High school | 190 (68) | 176 (62) | |
| > High school | 90 (32) | 108 (38) | |
| Paternal education | NS | ||
| ⩽ High school | 181 (68) | 171 (63) | |
| > High school | 87 (32) | 99 (37) | |
| Working mother at time of interview | NS | ||
| Yes v no | 173 (62) | 191 (67) | |
| Socioprofessional categories† | NS | ||
| Professional, technical workers, administrators, and managers | 147 (52) | 160 (56) | |
| Clerical, sales, and services workers | 55 (20) | 49 (17) | |
| Factory and agricultural workers | 78 (28) | 76 (27) | |
| Place of residence (number of inhabitants) | NS | ||
| <5000 | 40 (14) | 37 (12) | |
| 5000–9999 | 10 (4) | 5 (2) | |
| 10000–19999 | 5 (2) | 4 (1) | |
| 20000–49999 | 13 (5) | 5 (2) | |
| 50000–99999 | 8 (3) | 2 (1) | |
| 100000–199999 | 13 (5) | 3 (1) | |
| 200000–199999 | 41 (15) | 46 (16) | |
| ⩾2000000 | 148 (53) | 186 (65) | |