2.5. Statistical Analysis. Prior to enrolment of patients a
power calculation was undertaken.We assumed an improvement
in compliance score of at least 1.00 points on average.
We also assumed that there would be a baseline standard
deviation of compliance points of maximum 1.00. Under
these conditions a minimum of 40 participants in the project
was needed in order to achieve a power of 80% at a
significance level of 5%.