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Table 1 Percentage of missing values in several variables

From: Incidence rates of the primary brain tumours in Georgia - a population-based study

Variables Total Missing (%) Unclassified (%)
Case numbers 980 0 -
Age 977 0.3% -
Sex 916 6.5% -
Histology group 980 0 37.8%
Specific histology 973 0.7% 37.8%
ICD-O morphology code 980 0 Unspecified 40.7%
Tumor behaviour 444 54.5% -
Tumor grade 377 61.5% -