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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