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Table 4 Relationship between number of cases and population prevalence of disease in each sub-population.

From: Choice of population structure informative principal components for adjustment in a case-control study

# of Cases in Population 1 # of Cases in Population 2 Fold increase in # of cases K1 K2
250 250 1 0.10 0.10
300 200 1.5 0.12 0.08
375 125 3 0.15 0.05
400 100 4 0.16 0.04
475 25 19 0.19 0.01