Table 1. Childhood Cancer Registry of Piedmont 1967–2011: Data quality indicators by calendar period.
Total number of cases per period (N), cases (number and percentage) identified through death certificate only (DCO), microscopically verified (MV) cases, cases with ill-defined or unspecified site (ICD-10: C26, C39, C48, C76, C80), cases based on imaging only, by calendar period of registration.
| Period of registration | N | DCO | MV | Ill-defined site | Imaging | ||||
|---|---|---|---|---|---|---|---|---|---|
| n | % | n | % | n | % | n | % | ||
| 1967–1976 | 874 | 55 | 6.29 | 717 | 82.04 | 27 | 3.09 | 97 | 11.10 |
| 1977–1986 | 1078 | 1 | 0.09 | 994 | 92.21 | 5 | 0.46 | 78 | 7.24 |
| 1987–1996 | 921 | 0 | 0.00 | 887 | 96.31 | 14 | 1.52 | 32 | 3.47 |
| 1997–2006 | 1347 | 0 | 0.00 | 1304 | 96.81 | 24 | 1.78 | 43 | 3.19 |
| 2007–2011 | 800 | 0 | 0.00 | 764 | 95.50 | 3 | 0.38 | 36 | 4.50 |
| Total | 5020 | 56 | 1.12 | 4666 | 92.95 | 73 | 1.45 | 286 | 5.70 |