Table 3 Ordinal logistic regression of binge drinking and friendship networks, comparing binge drinking frequency of “less than monthly to monthly” frequency with “ weekly to daily” with “never” binge drinking among adolescents in Belo Horizonte, Minas Gerais, Brazil (n = 891), 2010

Most Important groups of friends or close friends

School

3.77 (2.27–6.25)

3.55 (1.91–5.87)

<0.001

4.25 (2.25–8.03)

3.70 (1.84–7.45)

<0.001

2.91 (1.24–6.84)

2.44 (0.91–6.46)

0.073

Family

1.99 (1.16–3.43)

1.79 (0.98–3.27)

0.055

2.41 (1.24–4.72)

2.00 (0.96–4.17)

0.064

1.34 (0.52–3.44)

1.49 (0.50–4.50)

0.474

**Hobbies/ others

1.89 (1.00–3.57)

1.54 (0.78–3.04)

0.207

2.11 (0.89–4.96)

1.74 (0.71–4.29)

0.225

1.30 (0.49–3.45)

1.12 (0.37–3.35)

0.837

Church

1.00

1.00

1.00

1.00

1.00

1.00

Majority of friends that have the same work or occupation

Yes

1.57 (1.08–2.29)

1.25 (0.79–1.98)

0.340

1.60 (1.00–2.54)

1.20 (0.67–2.16)

0.538

1.50 (0.80–2.83)

1.31 (0.59–2.94)

0.505

No

1.00

1.00

1.00

1.00

1.00

1.00

Educational background or level for the majority of friends

Yes

1.40 (0.94–2.08)

0.73 (0.44–1.18)

0.200

1.53 (0.93–2.51)

0.80 (0.43–1.50)

0.492

1.17 (0.59–2.31)

0.63 (0.27–1.46)

0.282

No

1.00

1.00

1.00

1.00

1.00

Number of groups of friends

< 2

1.25 (0.84–1.85)

1.37 (0.89–2.11)

0.143

1.01 (0.62–1.65)

1.14 (0.68–1.93)

0.618

2.15 (1.06–4.36)

2.21 (1.00–4.87)

0.049

≥ 2

1.00

1.00

1.00

1.00

1.00

Age

15–16

0.98 (0.65–1.49)

0.82 (0.44–1.52)

0.524

0.84 (0.36–1.95)

0.66 (0.27–1.59)

0.358

0.95 (0.41–2.20)

0.88 (0.35–2.21)

0.793

17

1.17 (0.74–1.84)

1.48 (0.76–2.86)

0.245

1.31 (0.54–3.19)

1.01 (0.40–2.54)

0.974

2.22 (0.87–5.71)

2.44 (0.90–6.63)

0.081

18-19

1.00

1.00

1.00

Mother’s educational background

0–7 years

0.66 (0.45–0.98)

0.94 (0.56–1.58)

0.825

0.63 (0.39–1.01)

1.01 (0.52–1.95)

0.970

0.78 (0.40–1.51)

0.87 (0.36–2.11)

8 or more

1.00

1.00

1.00

1.00

1.00

1.00

Father’s educational background

0–7 years

0.60 (0.43–0.83)

1.08 (0.65–1.80)

0.751

0.61 (0.38–0.97)

0.93 (0.48–1.79)

0.830

0.88 (0.47–1.63)

1.47 (0.63–3.43)

0.376

8 or more

1.00

1.00

1.00

1.00

1.00

1.00

Type of school

Public

0.60 (0.40–0.89)

0.74 (0.45–1.23)

0.245

0.59 (0.36–0.96)

0.80 (0.43–1.49)

0.485

0.64 (0.33–1.25)

0.63 (0.30–1.35)

0.236

Private

1.00

1.00

1.00

1.00

1.00

1.00

IVS

Low Vulnerability

1.66 (1.15–2.41)

1.66 (1.05–2.62)

0.028

1.83 (1.46–2.92)

1.62 (0.90–2.92)

0.104

1.48 (0.80–2.76)

1.97 (0.90–4.32)

0.089

Great Vulnerability

1.00

1.00

1.00

1.00

1.00

1.00

Gender

Male

1.24 (0.94–1.62)

1.52 (1.01–2.28)

0.044

Female

1.00

1.00