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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

From: Factors associated with drug use in prison – results from the Norwegian offender mental health and addiction (NorMA) study

 UnadjustedAdjusted
OR (CI)P-valueaOR (CI)P-value
Sociodemographic factors
 Men1.88 (1.08–3.27)0.0272.03 (1.06–3.9)0.034
 Age (continuous)0.97 (0.96–0.99)<  0.0010.99 (0.97–1.01)0.262
 History of family problems2.01 (1.54–2.62)<  0.0011.13 (0.80–1.60)0.489
 Non-Nordic borne0.49 (0.33–0.73)< 0.0011.45 (0.85–2.49)0.172
 Secondary school or more0.58 (0.45–0.74)<  0.0011.00 (0.71–1.39)0.974
 Work or study before incarceration2.72 (2.10–3.53)<  0.0010.98 (0.69–1.38)0.889
Mental health status during prison
 HSCL10 score (continuous)1.03 (1.01–1.04)0.0021.00 (0.98–1.02)0.947
Crime
 Crime related to current incarceration
  Acquisitive crime2.37 (1.84–3.05)<  0.0011.26 (0.90–1.77)0.177
  Drug crime3.05 (2.34–3.98)<  0.0011.00 (0.70–1.43)0.993
  Violence0.95 (0.73–1.23)0.6700.93 (0.66–1.31)0.673
  Driving under the influence2.91 (2.14–3.95)<  0.0011.23 (0.83–1.81)0.299
Drug use measuresa
 Number of drugs used in lifetime (continuous)1.24 (1.21–1.28)<  0.0011.12 (1.07–1.17)<  0.001
 Daily use of (any) drugs before prison18.61 (11.99–28.89)<  0.0017.12 (3.99–12.70)<  0.001
 Injection drug use in lifetime5.16 (3.88–6.85)<  0.0011.21 (0.81–1.81)0.356
 Harmful drug use8.57 (5.68–12.93)<  0.0010.73 (0.39–1.38)0.329
 Intoxicated when committing the crime9.68 (5.92–15.82)<  0.0012.13 (1.13–4.03)0.020
  1. aIncluding non-prescribed medications