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

Table 4.

Logistic regression estimates (OR) of predictors of health risk behaviours (girls) [OR (95 % CI), n = 315]

Predictor variables Smoking Drinking Binge Drinking
Best friend is smoking 20 (10.3-38.9)*** 2.91 (1.78-4.77)*** 2.24 (1.36-3.68)**
Best friend drinks alcohol 6.69 (3.19-14)*** 18.8 (10-35.1)*** 5.5 (2.59-11.7)***
Friends’ smoking
 None/Minority of friends 1 1 1
 Half of friends 3.53 (1.85-6.74)*** 1.83 (1.01-3.34)* 2.92 (1.56-5.45)**
 Majority/All of friends 11.9 (6.17-23.1)*** 3.65 (1.85-7.19)*** 3 (1.64-5.5)***
Friends’ alcohol use
 None/Minority of friends 1 1 1
 Half of friends 1.33 (0.62-2.85) 4.63 (1.73-12.4)** 2.12 (1.01-4.84)*
 Majority/All of friends 2.62 (1.23-4.16)** 5.36 (2.32-12.4)*** 2.87 (1.52-5.43)**
Loneliness (cont.) 0.99 (0.95-1.02) 0.96 (0.92-0.99)* 0.97 (0.93-1)
Shyness (cont.) 0.97 (0.94-0.99)* 0.98 (0.95-1.01) 0.98 (0.95-1.01)
Need to belong (cont.) 0.97 (0.93-1.01) 0.99 (0.95-1.03) 0.98 (0.94-1.03)
Competitiveness (cont.) 1.02 (0.99-1.04) 1 (0.97-1.02) 1 (0.97-1.02)
Age (cont.) 1.21 (0.98-1.49) 1.37 (1.11-1.68)** 0.89 (0.72-1.11)

aReference category

*p < 0.05

**p < 0.01

***p < 0.001