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Table 3 Logistic regression models

From: Underage drinking on saturday nights, sociodemographic and environmental risk factors: a cross-sectional study

Logistic regression model 1, dependent variable: drinking on Saturday nights
   OR LL 95%CI UL 95%CI p-value*
Female D 0.653 0.438 0.972 0.036
Age group D 1.332 0.999 1.776 0.051
Belonging to a group that breaks the rules S 1.832 1.104 3.039 0.019
Not being the group leader S 0.743 0.599 0.921 0.007
Perception of drinking by own group S 1.375 1.273 1.484 0.000
Staying alone E-pe 0.305 0.145 0.642 0.002
Going to bars E-pl 2.700 1.302 5.597 0.008
Going to discos E-pl 4.021 1.504 10.751 0.006
Watching a film E-a 0.581 0.356 0.949 0.030
Returning home after midnight E-a 1.878 1.132 3.114 0.015
Logistic regression model 2, dependent variable: binge drinking on Saturday nights (drink more than five alcoholic units)
   OR LL 95%CI UL 95%CI p-value*
Female D 0.23 0.08 0.63 0.004
Belonging to a group that breaks the rules S 2.77 1.30 5.89 0.008
Perception of drinking by own group S 1.25 1.10 1.43 0.001
Perception of dangers of drinking and driving S 0.84 0.74 0.96 0.008
Going to discos E-pl 5.04 2.03 12.52 0.000
Flirting E-a 4.28 1.92 9.53 0.000
Returning home after midnight E-a 2.20 1.04 4.65 0.039
Ordered logistic regression model 3, dependent variable: Attitudes to drinking (non-drinker = 1, ex-drinker = 2, drinker who wants to stop = 3, drinker who does not want to stop = 4)
   OR LL 95%CI UL 95%CI p-value*
Age group D 2.31 1.78 3.01 0.000
Not being the group leader S 0.84 0.69 1.01 0.080
Belonging to a group that breaks the rules S 1.98 1.25 3.16 0.004
Perception of drinking by own group S 1.40 1.28 1.52 0.000
Perception of drinking by parents S 1.21 1.11 1.32 0.000
Staying alone E-pe 0.53 0.30 0.94 0.024
Being with own group E-pe 0.60 0.41 0.90 0.013
Going to bars E-pl 2.14 1.06 4.31 0.033
Wandering around E-pl 1.52 1.05 2.20 0.027
Watching a film E-a 0.68 0.44 1.07 0.098
Playing with the computer E-a 0.40 0.23 0.69 0.001
Returning home after midnight E-a 2.51 1.47 4.29 0.001
  1. Abbreviation:
  2. OR = adjusted odds ratio
  3. LL 95%CI = lower limit 95% confidence interval
  4. UL 95%CI = upper limit 95% confidence interval
  5. D = demographic variables
  6. S = social variables
  7. E = environmental conditions (E-pe = people, E-pl = places and E-a = activities)
  8. * p for Wald test (1 df)