Table 3 Logistic regression estimates (OR) of predictors of health risk behaviours (boys) [OR (95 % CI), n = 155]

Best friend is smoking

11.7 (4.75-28.9)***

3.72 (1.54-9)**

1.78 (0.91-3.45)

Best friend drinks alcohol

2.86 (0.92-8.9)

45.8 (13.4-156)***

21.9 (2.82-170)**

Friends’ smoking

 None/Minority of friends

1

1

1

 Half of friends

5.56 (1.96-15.8)**

4.07 (1.12-14.8)*

2.32 (0.95-5.66)

 Majority/All of friends

18.4 (6.77-49.9)***

4.22 (1.34-13.3)*

2.62 (1.16-5.93)*

Friends’ alcohol use

 None/Minority of friends

1

1

1

 Half of friends

2.58 (0.99-6.74)

1.15 (0.38-3.49)

1.07 (0.42-2.77)

 Majority/All of friends

1.29 (0.57-2.92)

2.3 (0.8-6.62)

2.37 (1.06-5.32)*

Loneliness (cont.)

0.95 (0.91-0.99)*

0.93 (0.89-0.97)**

0.91 (0.86-0.96)**

Shyness (cont.)

0.98 (0.93-1.02)

0.95 (0.90-0.99)*

0.97 (0.93-1.01)

Need to belong (cont.)

0.99 (0.93-1.06)

1.06 (0.99-1.14)

1.05 (0.98-1.12)

Competitiveness (cont.)

0.99 (0.96-1.03)

1.06 (1.01-1.11)*

1 (0.96-1.04)

Age (cont.)

1.38 (0.97-1.95)

1.49 (1.02-2.16)*

1.67 (1.19-2.36)**