Skip to main content

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