Second primary cancer risk - the impact of applying different definitions of multiple primaries: results from a retrospective population-based cancer registry study

Table 1 Number of second primary cancers and person-years of follow up

Time since primary cancer diagnosis	Second cancers* (n)	Person-years (years)	Crude rate (per 100 person-years)	Standarised rate† (per 100 person-years)
0 days	487	0	-	-
1- 60 days	342	8605	4.0	2.1
61 days - 1 year	455	33365	1.4	0.7
>1 -5 years	1682	103464	1.6	0.8
0-5 years	2966	145435	2.0	1.0

ISSN: 1471-2407