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Table 4 Power calculations with n = 350 in each arm + 20% for attrition

From: The Indigenous Birthing in an Urban Setting study: the IBUS study

Outcome From % To % No./ cohort Power
Proportion of women who attend ≥ 5 antenatal visits 81.0 90.0 261 0.924
Proportion of women who were smoking after 20 weeks 42.0 31.0 318 0.858
Preterm birth < 37 weeks pregnancy 16.0 9.0 350 0.801
Exclusive Breast feeding at discharge (2007–09 Mater data) 78.0 88.0 240 0.942