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Table 1 Calculation of sample size

From: RADAR – A ra ndomised, multi-centre, prospective study comparing best medical treatment versus best medical treatment plus renal artery stenting in patients with haemod ynamically relevant atherosclerotic renal ar tery stenosis

Expectation value Relev. Variance1/2 Sig. level Statistical Sample
Therapy Ref. Min. diff. level Therapy Ref. k = 1-sided power size
mueT mueC Delta delta sigmaT sigmaC nT/nC alpha = 0.05 1-beta N = nT+ nC
5.5 -1.0 6.5 2.0 14.0 14.0 1.50 1 0.80 250