Table 4 Factors associated with drug use in prison (n = 1499). Unadjusted and adjusted odds ratios (OR) and 95% confidence intervals (CI) from logistic regression

 Men

1.88 (1.08–3.27)

0.027

2.03 (1.06–3.9)

0.034

 Age (continuous)

0.97 (0.96–0.99)

<  0.001

0.99 (0.97–1.01)

0.262

 History of family problems

2.01 (1.54–2.62)

<  0.001

1.13 (0.80–1.60)

0.489

 Non-Nordic borne

0.49 (0.33–0.73)

< 0.001

1.45 (0.85–2.49)

0.172

 Secondary school or more

0.58 (0.45–0.74)

<  0.001

1.00 (0.71–1.39)

0.974

 Work or study before incarceration

2.72 (2.10–3.53)

<  0.001

0.98 (0.69–1.38)

0.889

 HSCL10 score (continuous)

1.03 (1.01–1.04)

0.002

1.00 (0.98–1.02)

0.947

  Acquisitive crime

2.37 (1.84–3.05)

<  0.001

1.26 (0.90–1.77)

0.177

  Drug crime

3.05 (2.34–3.98)

<  0.001

1.00 (0.70–1.43)

0.993

  Violence

0.95 (0.73–1.23)

0.670

0.93 (0.66–1.31)

0.673

  Driving under the influence

2.91 (2.14–3.95)

<  0.001

1.23 (0.83–1.81)

0.299

 Number of drugs used in lifetime (continuous)

1.24 (1.21–1.28)

<  0.001

1.12 (1.07–1.17)

<  0.001

 Daily use of (any) drugs before prison

18.61 (11.99–28.89)

<  0.001

7.12 (3.99–12.70)

<  0.001

 Injection drug use in lifetime

5.16 (3.88–6.85)

<  0.001

1.21 (0.81–1.81)

0.356

 Harmful drug use

8.57 (5.68–12.93)

<  0.001

0.73 (0.39–1.38)

0.329

 Intoxicated when committing the crime

9.68 (5.92–15.82)

<  0.001

2.13 (1.13–4.03)

0.020