Table 3 Multilevel logistic regression modelling

Individual-level

Personal

Age

1.27 (1.25–1.29)

1.23 (1.21–1.25)

Gender

 Female

1

1

 Male

0.65 (0.62–0.68)

0.64 (0.61–0.67)

Pocket money

 Less than $US 10

1

1

 $US 10–20

1.22 (1,15–1.28)

1.22 (1.16–1.29)

 $US 20–40

1.39 (1.31–1.47)

1.40 (1.32–1.48)

 $US 40–100

1.68 (1.56–1.80)

1.69 (1.57–1.82)

 More than $US 100

1.69 (1.54–1.86)

1.69 (1.53–1.85)

Religious service attendance

 Never or almost never

1

1

 Once in a while monthly or yearly

0.97 (0.92–1.02)

0.98 (0.94–1.03)

 Weekly

0.79 (0.74–0.83)

0.79 (0.74–0.84)

Risk perception on drug use

 Lowest Q1, Q2, Q3

1

1

 Highest Q1

0.50 (0.48–0.52)

0.51 (0.48–0.53)

Family

Parental smoking

 No

1

1

 Yes

1.72 (1.65–1.80)

1.71 (1.64–1.78)

Family structure:

 Without both parents

1

1

 With both parents

0.82 (0.78–0.86)

0.83 (0.79–0.87)

Parents know where they are after school

 They never or almost never know where you are

1

1

 Sometimes they know

1.12 (1.02–1.23)

1.11 (1.02–1.22)

 They always or almost always know where you are

0.55 (0.51–0.60)

0.56 (0.51–0.61)

Parents know what they do at school

 Nothing

1

1

 Some

0.98 (0.81–1.18)

0.99 (0.82–1.20)

 Very Much

0.82 (0.68–0.98)

0.83 (0.69–1.00)

Parents know friends

 A little

1

1

 More or less

0.92 (0.87–0.98)

0.93 (0.88–0.99)

 Very well

0.88 (0.83–0.94)

0.91 (0.85–0.97)

Talk about drug with parents

 No

1

1

 Yes

0.99 (0.95–1.04)

0.99 (0.95–1.04)

School-level

School ethos

School Bonding

0.87 (0.82–0.92)

0.93 (0.88–0.98)

School Truancy

1.99 (1.74–2.27)

1.34 (1.18–1.53)

School Drug availability perception

1.76 (1.60–1.95)

1.23 (1.12–1.36)

School context

Math Test score

0.997 (0.996–0.998)

0.997 (0.996–0.998)

School area

 Urban

1

1

 Rural

0.95 (0.80–1.13)

0.99 (0.83–1.18)

School denomination

 Non-religious

1

1

 Religious

1.05 (0.98–1.13)

1.06 (0.99–1.14)

School Sex composition

 Only girls

1

1

 Co-educational

0.77 (0.69–0.84)

1.00 (0.91–1.11)

 Only boys

0.67 (0.57–0.78)

1.02 (0.87–1.19)

School type (proxy variable of socioeconomic status)

 Municipal

1

1

 Subsidized

1.22 (1.14–1.30)

1.06 (0.99–1.13)

 Private

1.29 (1.13–1.47)

1.04 (0.92–1.19)

Random Intercept

 Beta (T00)

0,29*

0.34*

0.34*

0.29*

 (Intra-class Correlation) ICC (%)

8.11

3.42

3.39

2.46

 C-statistic (95%CI)

0.73 (0.73–0.74)

0.65 (0.64–0.65)

0.73 (0.72–0.73)