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Table 2 Internal consistency of knowledge, attitude and harm scales

From: Drug education in victorian schools (DEVS): the study protocol for a harm reduction focused school drug education trial

Scale alpha p Component factors % of variance
Knowledge scale .859 < 0.001   
Attitudes towards alcohol .387 < 0.001 Knowledge and communication 30.6
    Harm 23.5
Alcohol harm scale .949 < 0.001   
Attitudes towards tobacco .445 < 0.001 Harm 32.4
    Knowledge and communication 21.1
Tobacco harm scale .802 < 0.001   
Attitudes towards cannabis .548 < 0.001   
Cannabis harm scale .891 < 0.001   
Attitudes towards other drugs .284 < 0.001 Knowledge and communication 32.7
    Harm 25.2
Other drugs harm scale .609 < 0.001