From: Temporal clustering of neuroblastic tumours in children and young adults from Ontario, Canada
 |  | Number of cases (%) |  |
Overall (0-19 years) |  | 876 (100) |  |
Males | Â | 481 (54.9) | Â |
Females | Â | 395 (45.1) | Â |
Age at diagnosis: | |||
  < 18 months |  | 393 (44.9) |  |
 18 months – 4 years |  | 364 (41.6) |  |
 5 – 19 years |  | 119 (13.6) |  |
Time period: | |||
 1985-1992 |  | 193 (22.0) |  |
 1993-2000 |  | 203 (22.2) |  |
 2001-2008 |  | 227 (25.9) |  |
 2009-2016 |  | 253 (28.9) |  |
 | Mean | Median | Quartile 1, Quartile 3 |
Age at diagnosis (years) | 2.57 | 1.77 | 0.67, 3.66 |
Annual number of cases | 27.4 | 27 | 21, 32 |