Table 1 Self-reported cannabis use by group and questionnaire format (expressed in %), using Questions 2 to 7 of the ASSIST V3.0 questionnaire

2. In the past three months how often have you used cannabis?

830.2

<0.0005

- Never

75.3

2.5

- One or two times

3.3

3.9

- Monthly

5.3

4.2

- Weekly

6.0

15.4

- Daily or almost daily

10.0

74.0

3. During the past three months how often have you had a strong desire or urge to use cannabis?

381. 9

<0.0005

- Never

78.0

12.3

- One or two times

4.0

14.0

- Monthly

2.7

5.3

- Weekly

6.7

18.4

- Daily or almost daily

8.7

50.1

4. During the past three months how often has your use of cannabis led to health, social, legal or financial problems?

110.9

<0.0005

- Never

88.6

45.0

- One or two times

3.4

21.2

- Monthly

2.0

13.3

- Weekly

2.7

11.8

- Daily or almost daily

3.4

8.7

5. During the past three months how often have you failed to do what was normally expected of you because of your use of cannabis?

168.7

<0.0005

- Never

96.0

40.5

- One or two times

0

22.3

- Monthly

0.7

10.9

- Weekly

2.7

15.6

- Daily or almost daily

0.7

10.8

6. Has a friend or relative or anyone else ever expressed concern about your use of cannabis?

147. 8

<0.0005

- No, never

60.2

35.3

- Yes, in the past three months

9.3

17.2

- Yes, but not in the past three months

6.0

47.5

7. Have you ever tried to control, cut down or stop using cannabis?

157.7

<0.0005

- No, never

88.7

35.3

- Yes, in the past three months

5.3

25.8

- Yes, but not in the past three months

6.0

38.9

Cannabis involvement score (sum of responses to Q2-Q7)

4.2 (8.7)

22.8 (9.9)

−24.3*

<0.0005

Risk level according to ASSIST v3.0

874.3

<0.0005

- Low (0–3)

77.3

3.3

- Moderate (4–26)

18.7

54.2

- High (≥27)

4.0

42.5