Data Quality Indicators


MV% and DCO% are two of the common quality indicators for assessing data completeness. A high MV% is taken to mean accuracy of diagnosis. Conversely, a high DCO% implies high proportion of incomplete case ascertainment due to failure to capture cases while patients are alive. The charts below show the MV%, DCO% and CDx% (percentage of clinically diagnosed cases, i.e. the diagnosis is based on signs and symptoms.) for selected cancers in Hong Kong since 1983.

(The sum of MV%, DCO% and CDx% in the graphs may not be equal to 100 due to round up.)