Table 2.
Observed and expected numbers of childhood leukemia cases by calendar year in the 5-km study region located in the Elbmarsch, Germany (1990–2005).
| Year | No. observed | National referent expecteda | County referent expectedb |
|---|---|---|---|
| 1990 | 3 | 0.22 | 0.34 |
| 1991 | 2 | 0.23 | 0.34 |
| 1992 | 0 | 0.23 | 0.22 |
| 1993 | 0 | 0.24 | 0.22 |
| 1994 | 1 | 0.24 | 0.40 |
| 1995 | 2 | 0.23 | 0.21 |
| 1996 | 1 | 0.24 | 0.23 |
| 1997 | 0 | 0.25 | 0.25 |
| 1998 | 0 | 0.24 | 0.28 |
| 1999 | 0 | 0.27 | |
| 2000 | 0 | 0.27 | |
| 2001 | 1 | 0.27 | |
| 2002 | 1 | 0.27 | |
| 2003 | 1 | 0.27 | |
| 2004 | 1 | 0.27 | |
| 2005 | 1 | 0.27 |
a
Expected counts were derived using annual age-specific German national childhood leukemia incidence rates as the referent.
b
Expected counts were derived using annual age-specific childhood leukemia incidence rates for the six counties surrounding the study region as the referent.