*Experimental group by class level significantly improved from pre-test to post-test compared to control group (p = 0.0001)^{$Freshmen pre-test scores lower than seniors’ (p = 0.059)
**Sophomore pre-test scores significantly lower than
juniors’ & seniors’ (p = 0.05; p = 0.022)}

+Improvements were not significant among groups at post-test (p = 0.317)