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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