Multiple primary malignancies involving primary sporadic colorectal cancer in Japan: incidence of gastric cancer with colorectal cancer patients may be higher than previously recognized

Table 3 Comparison of clinical features between synchronous gastric cancer with colorectal cancer patients and gastric cancer among screened group

	Colorectal cancer patients with synchronous gastric cancer	Gastric cancer among screened group	P ^a
	( n = 26/1,111)	( n = 225/200,007)
Age (years)	69 (58–87)	71 (42–95)	0.600^b
Sex:			0.66
Male	20 (76.9)	164 (72.9)
Female	6 (23.1)	61 (27.1)
Incidence	2.34	0.11	<0.001^c

ISSN: 1477-7819