Table 1.

Characteristics of the study cohort

Study cohort	First primary cancers		Second primary cancers
	Number of cases	%	Number of cases	%
Total	59,638	100	4949	100
Sex
Males	31,215	52.3	3036	61.3
Females	28,423	47.7	1913	38.7
Age at first diagnosis
15–24	656	1.1	8	0.2
25–49	9143	15.3	439	8.9
50–64	19,119	32.1	1784	36.0
65–79	23,424	39.3	2356	47.6
80+	7296	12.2	362	7.3
Period of first diagnosis
1988–1990	7764	13.0	706	14.3
1991–1995	15,140	25.4	1487	30.0
1996–2000	16,837	28.2	1526	30.8
2001–2005	19,897	33.4	1230	24.9
Follow-up interval
2 months to less than 1 year	8851	14.8	546	11.0
1 year to less than 5 years	13,279	22.3	1928	39.0
5 years to less than 10 years	17,563	29.4	1522	30.8
10 years or longer	19,945	33.4	953	19.3