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Table 3 Associations between age at first substance use and cannabis use frequency among subjects who reported using cannabis in the last month – linear regression (n = 394)

From: Relationships between age at first substance use and persistence of cannabis use and cannabis use disorder

Age at first use

Cannabis use frequency

β

S.E.

95% CI

P-value

All subjects

 Alcohol (n = 386)

  Model 1

−0.807

0.25

−1.295, −0.318

.001

  Model 2

−0.781

0.25

−1.269, −0.294

.002

  Model 3

−0.452

0.24

−0.928, 0.023

.062

 Tobacco (n = 368)

  Model 1

−0.653

0.15

−0.946, −0.360

<.001

  Model 2

−0.674

0.15

−0.968, −0.379

<.001

  Model 3

−0.547

0.15

−0.836, −0.258

<.001

 Cannabis (n = 390)

  Model 1

−0.675

0.12

−0.918, −0.432

<.001

  Model 2

−0.793

0.13

−1.042, −0.543

<.001

  Model 3

−0.634

0.12

−0.878, −0.390

<.001

Subjects aged 15–34 years

 Alcohol (n = 298)

  Model 1

−0.962

0.29

−1.531, −0.393

.001

  Model 2

−0.982

0.29

−1.552, −0.412

.001

  Model 3

−0.661

0.29

−1.228, −0.093

.023

 Tobacco (n = 282)

  Model 1

−1.430

0.20

−1.829, −1.032

<.001

  Model 2

−1.458

0.21

−1.862, −1.054

<.001

  Model 3

−1.138

0.21

−1.560, −0.717

<.001

 Cannabis (n = 302)

  Model 1

−1.413

0.20

−1.801, −1.026

<.001

  Model 2

−1.521

0.20

−1.912, −1.130

<.001

  Model 3

−1.343

0.21

−1.751, −0.935

<.001

  1. Unstandardized β coefficients, standard errors (S.E.) and 95% confidence intervals (CI) are shown
  2. Model 1: univariate
  3. Model 2: adjusted for sex and age (continuous)
  4. Model 3: adjusted for sex, age, marital status, region, education, employment, housing tenure, other lifetime drug use, current use of alcohol or tobacco and year of data collection
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BMC Public Health

ISSN: 1471-2458

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