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Table 4 The sample size needed to show the risk of DVT in relation to air travel

From: The association between air travel and deep vein thrombosis: Systematic review & meta-analysis

Background annual incident rate Background Weekly incidence rate Assuming Odds Ratio associated with travelling is Number of air travellers needed/ week Number of non air travellers/ week Events of exposed/ week Events of unexposed/ week Extra events in exposed/ week Total events/ week
1/1,000 2/100,000 2 1,275,418 1,275,418 52 26 26 78
1/1,000 2/100,000 3 392,463 392,463 24 8 16 32