Table 1. Categories of the maudsley addiction profile used to guide this review and examples of variables included within each category.

Category	Variables
Demographics	Age
	Gender
	Location
	Race
Substance use	Poly-drug use
	Cannabis use
	Benzodiazepine use
	Cocaine use
	Heroin use
	Alcohol use
	Amphetamines/ecstasy
	Drug use patterns
Treatment Factors	Medication type
	Dosage
	Previous treatments
	Year of treatment intake
	Treatment setting
	Treatment facilities
Health Risk Behaviour	Sexual behaviour
	Injecting
	Sharing needles
Health Symptoms	Non-fatal overdose
	Mental health
	Physical health
	HIV+/-
	Tuberculosis (TB) +/-
Social Functioning	Residence, work and training, relationships, illegal behaviours
	Marital Status
	Employment status
	Income
	Education
	Living status
	Social Support
	Legal issues