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

Table 2.

Logistic regression estimates (OR) of predictors of health risk behaviours [OR (95 % CI), n = 471]

Predictor variables Smoking Drinking Binge drinking
Best friend is smoking 16.7 (9.79-28.5)*** 3.1 (2.02-4.74)*** 2.08 (1.4-3.08)***
Best friend drinks alcohol 5.28 (2.85-9.8)*** 24.2 (13.9-42.2)*** 7.51 (3.75-15)***
Friends’ smoking
 None/Minority of friends 1 1 1
 Half of friends 4.01 (2.32-6.95)*** 2.11 (1.24-3.59)** 2.67 (1.61-4.44)***
 Majority/All of friends 13.7 (7.93-23.6)*** 3.86 (2.17-6.91)*** 2.93 (1.81-4.74)***
Friends’ alcohol use
 None/Minority of friends 1 1 1
 Half of friends 1.73 (0.96-3.11) 2.93 (1.42-6.02)** 1.7 (0.95-3.05)
 Majority/All of friends 1.84 (1.14-2.97)* 4.35 (2.27-8.31)*** 2.87 (1.75-4.70)***
Loneliness (cont.) 0.95 (0.92-0.98)** 0.95 (0.93-0.98)** 0.98 (0.95-1.02)
Shyness (cont.) 0.97 (0.95-0.99)* 0.97 (0.95-0.99)* 0.97 (0.95-0.99)*
Need to belong (cont.) 0.98 (0.94-1.01) 1 (0.96-1.03) 1 (0.93-1.03)
Competitiveness (cont.) 1 (0.99-1.03) 1.01 (0.99-1.04) 1.01 (0.98-1.02)
Gender
 Girla 1 1 1
 Boy 1 (0.67-1.49) 1.99 (1.29-3.07)** 1.57 (1.04-2.37)
Age (cont.) 1.24 (1.04-1.48)* 1.45 (1.21-1.74)*** 1.12 (0.94-1.33)

aReference category

*p < 0.05

**p < 0.01

***p < 0.001