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Table 2 Associations between age at first substance use and cannabis use patterns among subjects who reported lifetime cannabis use – multinomial logistic regression (n = 2979)

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

Age at first use

Cannabis use patterns

Recent use vs. former use

Current use vs. former use

OR

95% CI

P-value

OR

95% CI

P-value

All subjects

 Alcohol (n = 2901)

  Model 1

0.86

0.81, 0.91

<.001

0.77

0.72, 0.81

<.001

  Model 2

0.93

0.87, 0.99

.036

0.82

0.76, 0.87

<.001

  Model 3

0.95

0.89, 1.02

.164

0.89

0.83, 0.95

.001

 Tobacco (n = 2371)

  Model 1

0.99

0.96, 1.03

.757

0.93

0.90, 0.97

<.001

  Model 2

1.01

0.97, 1.06

.627

0.93

0.89, 0.97

.001

  Model 3

1.02

0.98, 1.07

.286

0.97

0.92, 1.02

.19

 Cannabis (n = 2956)

  Model 1

0.91

0.88, 0.94

<.001

0.83

0.80, 0.86

<.001

  Model 2

0.99

0.96, 1.03

.71

0.89

0.85, 0.93

<.001

  Model 3

1.01

0.97, 1.04

.75

0.96

0.92, 1.00

.036

Subjects aged 15–34 years

 Alcohol (n = 1584)

  Model 1

0.90

0.82, 0.98

.011

0.83

0.76, 0.90

<.001

  Model 2

0.96

0.88, 1.06

.434

0.87

0.80, 0.95

.002

  Model 3

1.00

0.91, 1.10

.969

0.95

0.86, 1.04

.264

 Tobacco (n = 1289)

  Model 1

1.03

0.97, 1.09

.377

0.97

0.92, 1.02

.251

  Model 2

1.05

0.98, 1.11

.157

0.97

0.92, 1.03

.333

  Model 3

1.06

0.99, 1.14

.066

0.99

0.93, 1.06

.869

 Cannabis (n = 1608)

  Model 1

0.92

0.87, 0.97

.001

0.82

0.78, 0.87

<.001

  Model 2

0.99

0.94, 1.06

.844

0.87

0.82, 0.92

<.001

  Model 3

1.01

0.95, 1.08

.768

0.93

0.86, 0.99

.027

Subjects aged 35+ years

 Alcohol (n = 1315)

  Model 1

0.90

0.81, 1.00

.039

0.73

0.66, 0.81

<.001

  Model 2

0.92

0.82, 1.02

.102

0.75

0.68, 0.83

<.001

  Model 3

0.91

0.81, 1.01

.086

0.81

0.73, 0.91

<.001

 Tobacco (n = 1081)

  Model 1

0.99

0.93, 1.05

.784

0.89

0.83, 0.95

.001

  Model 2

1.00

0.94, 1.06

.894

0.90

0.84, 0.96

.001

  Model 3

1.00

0.94, 1.07

.957

0.94

0.87, 1.01

.077

 Cannabis (n = 1346)

  Model 1

0.98

0.94, 1.02

.287

0.90

0.86, 0.96

<.001

  Model 2

0.99

0.95, 1.03

.591

0.92

0.87, 0.97

.002

  Model 3

0.99

0.95, 1.04

.77

0.95

0.91, 1.00

.063

  1. Odds ratios (OR) 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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