The observation check list was intended to assess student’s
performance of BSE before and after the intervention. It was
adopted from Sangchan et al. (2008). The list included 10
items each scored as either “done” or “not done.” For each
step, a correct action was scored 1 and the incorrect zero. The
scores of the items were summed-up and converted into a
percent score. The practice was considered adequate if the
percent score was 60% or more and inadequate if less than
60%.