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Table 1 Age-standardized rates (ASRs) of nasopharyngeal carcinoma (NPC) incidence in Sihui County, Guangdong Province, South China from 1987 to 2011

From: Incidence trend of nasopharyngeal carcinoma from 1987 to 2011 in Sihui County, Guangdong Province, South China: an age-period-cohort analysis

Year Males Females
Cases Crude incidence (/100,000) ASR (/100,000) Cases Crude incidence (/100,000) ASR (/100,000)
1987 31 18.15 20.64 25 14.81 16.59
1988 47 27.20 30.47 17 10.00 10.63
1989 49 28.34 30.23 22 12.67 12.27
1990 51 28.49 30.34 26 14.87 14.81
1991 49 27.53 29.42 18 10.20 10.23
1992 48 26.35 26.66 40 22.53 21.90
1993 52 28.07 28.78 19 10.61 9.21
1994 64 33.95 33.56 31 17.19 17.32
1995 58 30.43 30.07 12 6.59 5.89
1996 62 32.04 34.75 28 15.25 14.69
1997 53 27.01 29.79 29 15.66 16.31
1998 56 27.88 32.72 21 11.14 11.34
1999 63 31.25 32.46 29 15.23 17.88
2000 52 25.68 26.07 28 14.65 14.22
2001 59 28.95 28.31 24 12.48 11.28
2002 62 30.33 29.71 23 11.89 11.44
2003 56 27.22 25.30 22 11.33 10.28
2004 58 27.94 27.87 23 11.85 10.50
2005 56 26.60 25.18 21 10.75 9.80
2006 77 36.35 35.77 36 18.22 15.99
2007 71 33.53 34.45 21 10.63 10.54
2008 76 36.03 37.28 38 19.00 18.33
2009 83 39.27 39.18 42 20.79 18.42
2010 83 39.17 30.91 32 15.74 11.79
2011 78 36.52 28.93 30 14.67 11.26
  1. The crude incidence is calculated by dividing the number of annual NPC cases by the total population. The ASRs of incidence were calculated by the direct method using the world standard population method of Segi (1960).