TABLE 2

Crude and Adjusted Relative Risks for Trying Smoking During Observation Period

ParameterRelative Risk95% CIa
CrudeAdjusted
Categorical variables
    Exposure to movie smoking
        Quartile 11.001.00Reference
        Quartile 21.551.371.09–1.68
        Quartile 32.201.781.39–2.29
        Quartile 42.881.961.55–2.47
    Age, y
        10–111.001.00Reference
        121.291.110.89–1.39
        131.561.090.83–1.43
        14–161.460.880.64–1.20
    Gender
        Male1.001.00Reference
        Female0.841.020.86–1.22
    School type
        Gymnasium (SES = mid to high)1.001.00Reference
        Gesamtschule (SES = mixed)1.111.040.86–1.25
        Realschule (SES = mid)1.691.411.06–1.89
        Hauptschule (SES = low)1.821.341.05–1.71
    Parent smoking
        No1.001.00Reference
        Yes1.401.070.89–1.27
    Sibling smoking
        No1.001.00Reference
        Yes1.981.571.29–1.92
    Friend smoking
        No1.001.00Reference
        Yes2.191.571.34–1.83
    School performance
        Excellent1.001.00Reference
        Good1.151.020.80–1.30
        Average/poor1.721.250.92–1.71
    Favorite tobacco ad
        No1.001.00Reference
        Yes1.781.381.15–1.65
Continuous variablesb
    Sensation seeking/rebelliousness2.511.531.20–1.96
    Parenting style0.660.980.80–1.20
  • a Adjusted for all of the variables listed.

  • b For continuous variables, the relative risk represents increased risk for each 1-point increase in the 3-point scale.