Table 3. Trends in participation rates in colorectal cancer screening program in Miyagi Prefecture and proportions of screen-detected incidence cases in Miyagi Prefectural Cancer Registry.
| Calendar year | ||||||||||
| 1980 | 1985 | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | |
| Participation rate in population-based screening program (%)* | ||||||||||
| – | – | – | – | – | 19.2 | 16.8 | 19.6 | 19.4 | 20.0 | |
| Proportion of screen-detected incidence cases (%) | ||||||||||
| Colon Cancer | ||||||||||
| Males | 3.1 | 4.2 | 9.3 | 11.5 | 13.2 | 25.0 | 29.1 | 26.6 | 25.8 | 25.8 |
| Females | 0.7 | 2.4 | 4.5 | 6.2 | 8.3 | 13.5 | 19.1 | 17.4 | 19.1 | 18.5 |
| Rectal Cancer | ||||||||||
| Males | 1.6 | 5.1 | 6.9 | 6.2 | 8.8 | 21.4 | 23.0 | 22.1 | 23.9 | 20.4 |
| Females | 0.0 | 4.2 | 3.2 | 6.0 | 2.2 | 14.0 | 18.4 | 15.6 | 11.5 | 15.5 |
* : Colorectal cancer screening was introduced as a public health program in 1993.26 Data according to sex are not available.