The sample consisted of 486 inpatients surveyed from January 2012
to April 2013 in the abovementioned units and who agreed to participate
in the study. A sample size of 150 was sufficient to detect a significant
reduction in PrUs based on a similar study completed in long-term care
by Lyder et al. (2004) where an intervention program reduced PrU from
13.2% to 1.7%, p = 0.02. Significance was set at [alpha] = .05, with
power set at 1 - [beta] = 0.80. Thus, a sample of 486 was more than
sufficient to detect significance before and after the intervention.