Table 2 Participants’ characteristics

Age

20.3 (1.3)

19.7 (1.1)

Age first drunk

15.6 (1.8)

15.4 (1.7)

Frequency six standard drinks or more (binge) on one occasion in the past 12 months

 - Never

23.8

17.8

 - Less than monthly

31.4

34.7

 - Once a month or more

44.8

47.5

Frequency of drinking during the week (Monday to Thursday) in days per week in the past 12 months

27.3 (42.4)

26.2 (41.7)

Age cannabis use onset

15.9 (2.0)

15.6 (1.9)

Age you got “high” on cannabis for the first time

15.9 (2.0)

15.7 (1.8)

Cannabis use last 12 months

 - Yes

32.0

28.9

 - No

68.0

71.1

Cannabis frequency of use last 12 months

 - Once a month or less

16.7

16.3

 - Once to 3 times per week

7.7

7.3

 - 4 to 5 times per week or more often

7.6

5.3

 - Never

68.0

71.1

Gaming use classification

 - Monothetic

2.3

2.3

 - Polythetic

10.6

8.1

-  Non-problematic game users

87.1

89.6

Major Depression Inventory

 - No depression

93.3

94.5

 - Mild to moderate depression

4.1

3.5

 - Severe depression

2.6

1.8

Brief Sensation Seeking (BSSS total scale)

 - Adventure subscale

2.9 (0.9)

3.2 (0.9)

 - Boredom subscale

2.8 (1.2)

3.1 (1.2)

 - Disinhibition subscale

2.7 (1.0)

3.1 (1.0)

 - Experience seeking subscale

2.9 (1.1)

3.0 (1.1)

Personality ZKPQ-50-cc

3.2 (1.2)

3.6 (1.1)

 - Aggression/hostility subscale

4.3 (2.3)

4.0 (2.1)

 - Anxiety subscale

2.1 (2.1)

1.9 (1.9)

 - Sociability subscale

5.9 (2.3)

5.9 (2.1)