Time trends of incidence of digestive system cancers in changle of China during 1988-2002

Table 1 Standard incidence of digestive system cancer per 100 000 persons in 1988-2002 in Changle (%)

Yr	Stomach cancer		liver cancer		Esophaguscancer		Colorectalcancer
	Male	Female	Male	Female	Male	Female	Male	Female
1988	106.63	28.54	32.62	10.48	20.22	6.36	3.1	6.3
1989	114.41	36.55	35.09	9.87	24.96	8.18	4.96	4.69
1990	109.09	29.59	51.86	10.76	28.81	12.48	5.93	4.56
1991	103.21	34.52	38.62	12.78	30.76	9.95	4.89	1.18
1992	100.81	26.1	32.47	7.66	25.52	7.45	2.44	4.11
1993	111.65	27.35	36.25	14.36	27.22	7.91	2.82	2.86
1994	98.73	24.9	44.54	11.09	22.38	7.92	4.04	2.16
1995	80.95	20.9	32.71	9.87	18.57	8.13	5.58	5.57
1996	85.42	19.52	32.87	7.63	18.7	4	6.24	4.43
1997	86.4	26.56	27.86	7.81	14.47	2.77	9.6	4.68
1998	81.81	21.82	35.48	16.29	12.96	4.07	5.86	5.33
1999	75.84	20.71	32.76	9.2	12.54	3.59	6.76	3.86
2000	83.96	25.63	32.81	10.99	15.15	2.63	5.39	3.82
2001	74.28	27.71	33.12	5.17	11.15	4.29	9.12	5.38
2002	65.33	20.88	20.81	8.85	8.41	4.46	6.57	8.03

Table 2 Incidence of four tumors both in men and women in Changle from 1988 to 2002 (%)

Disease	Men			Women
	Regression coefficient	R2	P	Regression coefficient	R2	P
Stomach cancer	3.16	0.851	< 0.001	0.72	0.415	0.009
Liver cancer	0.83	0.286	0.04	0.16	0.061	0.374
Esophagus cancer	1.33	0.736	< 0.001	0.48	0.567	0.001
Colorectal cancer	0.29	0.391	0.013	0.12	0.1	0.251