Table 2.

Age-standardized incidence and mortality rates of NPC per 100,000 during different time periods and the Estimated Annual Percent Changes (EAPC) in Sihui and Cangwu

	Period					EAPC (p value)
	1978–82	1983–87	1988–92	1993–97	1998–2002
Incidence Rate (number of cases)
Sihui
Male	28.07 (167)	28.68 (205)	28.65 (235)	28.03 (268)	30.94 (284)	+1.73% (0.215)
Female	12.29 (91)	14.79 (111)	13.35 (116)	11.81 (116)	13.00 (117)	-1.12% (0.739)
Cangwu
Male		17.81 (209)	18.68 (225)	19.43 (259)	19.76 (280)	+3.57% (0.020)
Female		7.44 (82)	6.91 (78)	7.23 (68)	7.33 (96)	0.00 (0.998)
Mortality Rate (number of cases)
Sihui
Male	24.42 (143)	20.49 (141)	20.65 (166)	19.56 (182)	21.95 (195)	-2.56% (0.413)
Female	10.47 (80)	9.43 (73)	8.95 (76)	9.01 (89)	7.73 (70)	-6.32% (0.016)
Cangwu
Male		12.53 (137)	18.38 (213)	18.41 (227)	15.00 (201)	+5.56% (0.622)
Female		4.97 (54)	6.27 (71)	7.26 (87)	4.73 (61)	-0.019% (0.999)