Sampling size and procedure
cancer
CANCER
A sample size of 1140 would allow approximately 90% power to detect, as statistically significant at the 5% level, an increase of 9% or more in the proportion aware of a BC symptom in the IG compared to the CG after the intervention (based upon our a priori estimates of baseline awareness of a breast lump as a cancer symptom of 65% from our previous study). A sample size of 1140 would also afford over 80% power to detect an absolute increase of 9% in the proportion of women who availed of a CBE following receipt of the intervention compared to the comparator group.