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OC knowledge score by gender; cigarette smoking; year of study; Alcohol counseling; and tobacco counseling. Statistical significance of the mean difference between groups was investigated by student t-test except for year of study where ANOVA test with Bonferonni correction was used. * No statistically significant difference was observed between mean scores of third and fourth year students; but score for 5th year students wassignificantly larger than both third and fourth years
