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. 2007 Jan 23;96(2):391–398. doi: 10.1038/sj.bjc.6603432

Table 1. Hierarchy of epidemiological data.

Quality of source Source type
α Australian National Epidemiological data
β Australian State Cancer Registry
γ Epidemiological databases from other large international groups (e.g. SEER)
E Results from reports of a random sample from a population
ε Comprehensive multi-institutional database
Z Comprehensive single-institutional database
Θ Multi-institutional reports on selected groups (e.g. multi-institutional clinical trials)
λ Single-institutional reports on selected groups of cases