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. 2015 Nov 7;15:1107. doi: 10.1186/s12889-015-2474-y

Table 3.

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

Predictor variables Smoking Drinking Binge drinking
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)**

aReference category

*p < 0.05

**p < 0.01

***p < 0.001