The participant group’s mean pretest score for
knowledge was 87.27%; the posttest mean score was
97.27% ( Figure 1 ). A test of mean differences showed
statistical significance in mean test scores for knowledge
from the pretest to the posttest (T
= 4.06, P = .001).
Further analysis of the participant group’s performance
on the pre- and posttests revealed inference related to
years of experience and educational preparation. For
example, when participants were grouped by years of scores by the variable of experience from pretest to
posttest (T = 3.38, P = .020). The 2 other participant
groups examined by years of experience—0 to 5 years
and 16 or more years—did not show a statistically significant
increase in knowledge.