Sample size
Sample size calculation was performed using the following formula: n = P
× (100 - P) × z2/d2. Where P is the anticipated awareness score percent,
d is the desired precision, z is the appropriate value from the normal
distribution for the desired confidence interval. Using 95% confidence
levels, 5% precision level and an anticipated 50% proportion of
participants receiving an appropriate score (this conservative value
results in the highest possible sample size that can be used in this
study, as no previous studies in this area where found to indicate level
of awareness), a sample size of 385 was required.