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Table 4 Duration of substance use in years in relationship to both dependency and comorbidity

From: Axis I comorbidity in adolescent inpatients referred for treatment of substance use disorders

  Substance use (years)
  Dependence*
Mean (SD)
No dependence*
Mean (SD)
Nominal p Comorbidity+
Mean (SD)
No comorbidity+
Mean (SD)
Nominal p
Alcohol 5.05 (2.48) 3.85 (1.91) .018 4.19 (1.85) 3.90 (2.15) .387
Cannabis 4.11 (1.89) 2.96 (1.50) .001 3.91 (1.89) 3.61 (1.82) .329
Amphetamine 2.42 (1.90) 1.78 (1.38) .098 1.82 (1.49) 1.95 (1.52) .665
Ecstasy 2.73 (2.05) 1.89 (1.41) .063 1.94 (1.63) 2.09 (1.52) .654
  1. Note: *referred to the corresponding substance, present diagnoses. +Present axis-I disorders excluding ADHD and CD.