The aim of this study was to investigate the effectiveness of structured teaching programme on knowledge regarding substance abuse among high school children in a selected high school at Kollam district. The objectives of the study was to assess the level of knowledge regarding substance abuse among high school children, to evaluate the effectiveness of structured teaching programme on knowledge regarding substance abuse among high school children and to find out the association between pretest knowledge scores regarding substance abuse among high school children with selected demographic variables. A quantitative pre experimental one group pretest posttest design was used. Using non probability purposive sampling 50 samples were selected. The mean posttest knowledge score 23.42 with standard deviation 4.50 was significantly higher than the mean pretest knowledge score 15.94 with standard deviation 3.71.The result of the study shows that there was improvement in the knowledge of the high school children after conducting the structured teaching programme and thus structured teaching programme was statistically significant at 0.001 level (t=10.5, p<0.001). There was no significant association between mean pretest knowledge scores with selected demographic variables. Hence the study suggested that the structured teaching programme was effective in improving the knowledge of the high school children regarding substance abuse.
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