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Table 1 Proportion (%) of diagnoses type for NPC incident cases, Mortality vs. incidence (M:I) ratios for males and females during different time periods in the Sihui and Cangwu Cancer Registries

From: Trends in incidence and mortality of nasopharyngeal carcinoma over a 20–25 year period (1978/1983–2002) in Sihui and Cangwu counties in southern China

Period Diagnoses type in Sihui Diagnosis type in Cangwu M:I Ratio in Sihui M:I Ratio in Cangwu
  Histological verification Clinical deduction Death certificate Histological verification Clinical deduction Death certificate Male Female Male Female
1978–82 89.1 10.1 0.80 - - - 0.87 0.85 - -
1983–87 89.6 9.50 0.90 95.5 2.41 2.06 0.71 0.64 0.70 0.67
1988–92 87.7 10.0 2.30 96.0 1.65 2.31 0.72 0.67 0.98 0.91
1993–97 85.2 13.0 1.80 96.5 2.02 1.44 0.70 0.76 0.95 1.00
1998–2002 90.3 8.90 0.80 97.3 1.06 1.60 0.71 0.59 0.76 0.65