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Table 4A Formula used for sample size calculation for pilot study.

From: The effects of organic nitrates on osteoporosis: a randomized controlled trial [ISRCTN94484747]

n = (Z 1-α/2+ Z 1-β )2 {1 + (n - 1)ρ}/(n Δ2), where n = 7, ρ = 0.2, Δ = , β = 0.1.