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Table 6 Ordered logistic regressions analysis of associations between recent substance use, derived from the latent variable, and problematic social networking site usage group: odds ratio and 95% confidence intervals (CI), p value

From: Problematic social networking site usage and substance use by young adolescents

Recent substance (alcohol, cigarettes and energy drinks) use

Odds ratio

[95% CI]

p

Significant Proportional Odds

Parish Group [ref. No]

0.57

0.35–0.93

0.025

≥500 text messages sent [ref. 0–15]

1.34

1.02–1.76

0.038

Gambling Yes [ref. No]

2.47

1.53–3.96

0.000

Siblings’ alcohol consumption Yes [ref. No]

4.81

1.60–14.42

0.005

Problematic social networking site usage Yes [ref. No]

2.93

1.77–4.85

0.000

Significant Not Proportional Odds

No vs Middle-High

Male

0.75

0.45–1.24

0.256

No obeying rules

1.38

0.82–2.30

0.224

Hours of sleep < 8 h

1.61

0.89–2.93

0.117

Weekly pocket money > 10 Euro

0.92

0.63–1.33

0.644

Siblings’ smoking Yes

0.77

0.35–1.69

0.522

No-Middle vs High

Male

0.34

0.15–0.76

0.009

No obeying rules

5.75

2.66–12.40

0.000

Hours of sleep < 8 h

3.34

1.50–7.41

0.003

Weekly pocket money > 10 Euro

2.06

1.25–3.39

0.005

Siblings’ smoking Yes

3.05

1.19–7.76

0.020

  1. CI confidence interval
  2. The following variables were tested and found unassociated (p < 0.05) with recent substance use (data not shown): Age, Nationality, Artistic activities, Playing sport, Returning home in the evenings, Hours spent watching TV, Father’s smoking, Friends’ smoking, Father’s alcohol consumption, Friends’ alcohol consumption, Mother’s alcohol consumption and Average school marks