TABLE 3. Age- specific fertility rates of subjects after a diagnosis of CRC, grouped by site of tumour (colon vs. rectum).

Age- specific fertility rates are given as births/ 1000 person- years. Total fertility rate (TFR) is given as births/ person. There were no men who developed rectal CA under the age of 20, so the age- specific fertility rate for the 15–19 year old subjects in this group could not be calculated. The sample sizes were too small to calculate meaningful confidence intervals for age- specific fertility rates for a number of groups.

Age groups	Births	Person- years	Fertility rate	95% C.I.	Births	Person- years	Fertility rate	95% C.I.
	After Colon CA diagnosis (women)				After Rectal CA diagnosis (women)
15–19	0	8	0	N/A	0	3	0	N/A
20–24	0	34	0	0–108	0	8	0	N/A
25–29	14	90	156	85–261	4	28	143	38–366
30–34	16	151	106	61–172	0	29	0	0–126
35–39	10	251	40	19–73	1	53	20	0.25–105
40–44	1	401	2.5	0.03–14	0	71	0	0–52
45–49	0	532	0	0–6.9	0	91	0	0–40
TFR			1.5	1.1–2.1			0.72	0.2–1.7
	After Colon CA diagnosis (men)				After Rectal CA diagnosis (men)
15–19	0	1	0	N/A	0	0	N/A	N/A
20–24	0	15	0	0–245	1	7	143	N/A
25–29	8	44	182	78–358	1	10	100	N/A
30–34	11	131	84	42–150	1	12	83	N/A
35–39	12	242	50	26–87	1	42	24	0.3–132
40–44	5	358	14	4.5–33	0	61	0	0–60
45–49	1	462	2.2	0–12	0	87	0	0–42
TFR			1.7	1.0–2.5			1.84	0.39–5.0