Table 2 Internal consistency of knowledge, attitude and harm scales

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