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Table 1 Quality of nasopharyngeal carcinoma (NPC) data in 2013 from 255 Chinese cancer registries

From: Nasopharyngeal carcinoma incidence and mortality in China, 2013

Areas Sex M/I ratio MV% DCO% UB%
All Both 0.52 75.12 1.18 0.65
Male 0.54 75.02 1.25 0.69
Female 0.48 75.36 1.02 0.53
Urban areas Both 0.51 77.20 1.09 0.35
Male 0.53 77.36 1.26 0.37
Female 0.45 76.78 0.66 0.28
Rural areas Both 0.54 72.78 1.29 0.99
Male 0.55 72.31 1.24 1.07
Female 0.50 73.88 1.40 0.80
Eastern area Both 0.46 75.62 1.31 1.76
Male 0.47 75.98 1.39 1.83
Female 0.45 74.82 1.12 1.57
Middle area Both 0.46 75.74 2.15 0.22
Male 0.47 75.73 2.01 0.16
Female 0.42 75.85 2.20 0.34
Western area Both 0.52 63.62 3.33 1.02
Male 0.56 63.56 3.61 0.70
Female 0.45 63.74 2.72 1.59
  1. M/I mortality to incidence, MV% the percentage of cases with morphologically verification, DCO% the percentage of cases with death certification only, UB% the percentage of diagnosis of unknown basis