Meta analysis of risk factors for colorectal cancer

Table 1 Case-control studies on risk factors of colorectal cancer

No	Author	Area	Number of cases	Number of cases	Sources of references
1	JIAO Den-Ao	Jiashan	160	9	Zhonghua Liuxingbingxue Zazhi, 1988, 9(6):354-357
2	WU Den-Ren	Jiashan	114	5	Shiyong Zhongliu Zazhi, 1990, 5(2): 95-99
3	YANG Gong	Shanghai	850	2	Zhonghua Liuxingbingxue Zazhi, 1992, 13(1): 30-33
4	ZHANG Cao	Beijing	250	5	Zhonghua Liuxingbingxue Zazhi, 1992, 13(6):321-323
5	ZOU Run	Jiashan	41	10	Zhongguo Manxingbing Yufang Yu Kongzhi, 1993, 1(5): 213-215
6	MEN Fan-He	Guangdong	100	3	Diyi Junyi Daxue Xuebao, 1994, 14(4): 281-283
9	LIU Xi-Yong	Jiashan	286	6	Zhongguo Manxingbing Yufang Yu Kongzhi, 1994, 2(3): 122-124
7	YANG Gong	Shanghai	1328	4	Zhonghua Liuxingbingxue Zazhi, 1994, 15(5):299-303
8	YANG Gong			3	Zhongguo Zhongliu Linchuang, 1995, 22(6):403-408
10	LAI Kuang-De	Dalian	129	3	Zhongguo Manxingbing Yufang Yu Kongzhi, 1995, 3(3):106-109
11	HE Xi-Zhen	Shenyang	390	2	Shiyong Zhongliuxue Zazhi, 1996, 10(2): 64-65
12	YANG Gong	Shanghai	3166	3	Zhongliu, 1996, 16(2): 74-78
13	ZOU Run	Hangzhou	245	5	Zhejiang Yike Daxue Xuebao, 1996, 25(5): 204-206
4	LIU Ai-Zong	Hunan	153	7	Zhongguo Gonggong Weisheng, 1997, 13(4):206-207