Table 4

Adjusted ORs and Confidence intervals for substance use overestimation

Variable

Adjusted OR (95% confidence interval)


Tobacco

Cannabis

Alcohol

HED


Tobacco use (reference: no use)


Low: < 1/day in the last month

0.68 (0.40 - 1.17)

-

NS

0.64 (0.41 - 0.99)


High: ≥ 1/day in the last month

0.52 (0.30 - 0.89)

0.47 (0.28 - 0.77)


Cannabis use (reference: no use)


Low: ≤ 1/week in the last 12 months

-

1.66 (1.11 - 2.51)

-

-


High: > 1/week in the last 12 months

2.37 (1.23 - 4.73)


Alcohol use (reference: no use)


Low: < 10 days in the last month

-

NS

1.95 (1.31 - 2.92)

-


High: ≥ 10 days in the last month

2.17 (1.10 - 4.23)


HED (reference: no use)


Low: < 4 times in the last month

-

-

-

1.85 (1.19 - 2.89)


High: ≥ 4 times in the last month

2.64 (1.35 - 5.29)


Discipline (reference: sociology)


Foreign language

-

0.78 (0.32 - 1.93)

0.44 (0.13 - 1.43)

0.75 (0.21 - 2.68)


Medicine

0.34 (0.18 - 0.64)

3.72 (2.28 - 6.11)

3.46 (2.12 - 5.70)


Nursing studies

0.35 (0.18 - 0.70)

1.16 (0.72 - 1.85)

1.01 (0.66 - 1.54)


Tobacco use prevalence in class

0.92 (0.89 - 0.94)

-

-

-


Cannabis use prevalence in class

-

0.92 (0.88 - 0.96)

-

-


Alcohol use prevalence in class

-

NS

0.96 (0.93 - 0.99)

1.04 (1.01 - 1.07)


HED prevalence in class

-

-

0.93 (0.87 - 0.99)

0.85 (0.79 - 0.91)


Gender (reference: male)

2.51 (1.56 - 4.02)

NS

-

1.75 (1.17 - 2.64)


Previous questionnaires (reference: no)

-

-

1.56 (1.10 - 2.21)

NS


Cannabis prevention campaigns

1.15 (1.02 - 1.34)

1.11 (1.02 - 1.22)

-

-


A "-" sign indicates that the variable was not included in this model. NS: the variable was included in the model but failed to reach significance at the 5% level. HED: Heavy episodic drinking.

Riou Franca et al. BMC Public Health 2010 10:169   doi:10.1186/1471-2458-10-169

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