Table 1.
Study/Country | Period | Number of Patients | Number of CRCs | Incidence Rate (%) |
---|---|---|---|---|
Haagsma et al, Netherlands4 | 1979–1986 | 174 | 3 | 1.7 |
Kelly et al, UK12 | 1988–1996 | 888 | 3 | 0.33 |
Jain et al, US15 | 1989–1992 | 1000 | 4 | 0.4 |
Vera et al, UK18 | 1986–2000 | 1336 | 15 | 1.1 |
Frezza et al, US19 | 1982–1992 | 1657 | 3 | 0.18 |
Silva et al, UK20 | 1986–2004 | 1593 | 18 | 1.1 |
Oo et al, UK21 | 1982–2004 | 1778 | 18 | 1 |
Fabia et al, US22 | 1984–1995 | 1085 | 6 | 0.55 |
Sanchez et al, US23 | 1985–1999 | 1421 | 7 | 0.49 |