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
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 |