Table 1. Clinicopathological characteristics of colorectal cancer patients recruited to the National Study of Colorectal Cancer Genetics.

	Number of patients (%)
Total	8722
Gender (male/female)	5175 (59%):3547 (41%)
Age at diagnosis (years)
<30	63 (0.1%)
31–35	75 (0.8%)
36–40	174 (2.0%)
41–45	329 (3.8%)
46–50	613 (7.0%)
51–55	1234 (14.2%)
56–60	1981 (22.7%)
61–65	2316 (26.6%)
66–69	1745 (20.0%)
70+	192 (2.2%)
Mean (SD), Median	58.8 (8.4), 60
Ethnicity
Asian	59 (0.7%)
Bangladeshi	1 (<0.1%)
Black-African	20 (0.2%)
Black-Caribbean	56 (0.7%)
Black-Other	8 (<0.1%)
Indian	69 (0.8%)
Jewish-Ashkenazi	18 (0.2%)
Jewish-Sephardic	1 (<0.1%)
Pakistani	13 (0.2%)
White	8477 (97.2%)
Type of colorectal cancer
Colonic disease (ICD-9 153)	5247 (60%)
Ascending	747
Hepatic flexure	159
Splenic flexure	178
Transverse colon	391
Descending colon	338
Sigmoid colon	2337
Caecal	1035
Other/not specified	62
Rectal disease (ICD-9 154)	3475 (40%)
Recto-sigmoid junction	509
Ampulla	2962
Other/not specified	4