Statistics found here the category is Studies of the problematic drug use population (PDU)

Category	Title
PDU	PDU-1. Estimates of the prevalence of problem drug use (rate per 1 000 population aged 15 to 64), studies from 2002 to 2006 — last study available Part (i) Estimates of overall problem drug use
PDU	PDU-1. Estimates of the prevalence of problem drug use (rate per 1 000 population aged 15 to 64), studies from 2002 to 2006 – last study available Part (ii) Estimates for problem opioid use
PDU	PDU-2. Estimates of the prevalence of injecting drug use (rate per 1000 population aged 15 to 64), 2002 to 2006 — last study available
PDU	PDU-3. Percentage of new and of young injectors reported in samples of injecting drug users tested for HIV or HCV, studies from 2004 to 2006
PDU	PDU-0. Prevalence of problem drug use at national and subnational level: bibliographic references
PDU	PDU-1. Prevalence of problem drug use at national level: Summary Table, 2002–06, rate per 1000 aged 15–64 Part (i) Overall problem drug use
PDU	PDU-1. Prevalence of problem drug use at national level: Summary Table, 2002–06, rate per 1000 aged 15–65 Part (ii) Injecting drug use
PDU	PDU-6. Estimated trends in the prevalence of problem and injecting drug use - 2001 to 2006 (rate per 1 000 population aged 15 to 64): Combined estimates per country Part (i) Estimated trends of overall problem drug use
PDU	PDU-6. Estimated trends in the prevalence of problem and injecting drug use - 2001 to 2006 (rate per 1 000 population aged 15 to 64): Combined estimates per country Part (ii) Estimated trends of problem opioid use
PDU	PDU-6. Estimated trends in the prevalence of problem and injecting drug use - 2001 to 2006 (rate per 1 000 population aged 15 to 64): Combined estimates per country Part (iii) Estimated trends of injecting drug use
PDU	PDU-6. Estimated trends in the prevalence of problem and injecting drug use - 2001 to 2006 (rate per 1 000 population aged 15 to 64): Combined estimates per country Part (iv) Estimated trends of problem stimulant use
PDU	PDU-102. Prevalence of problem drug use at national level - full listing of studies Part (i) Problem drug use
PDU	PDU-102. Prevalence of problem drug use at national level - full listing of studies Part (ii) Injecting drug use
PDU	PDU-103. Prevalence of problem drug use at subnational level - full list of studies Part (i) Problem drug users
PDU	PDU-103. Prevalence of problem drug use at subnational level - full list of studies Part (ii) Injecting drug users
PDU	PDU-104. Trends in injecting drug use - percentage currently injecting among all clients entering treatment for primary drug heroin, 2001 to 2006
PDU	PDU-105. Studies of IDU providing information on sample structure by age and years injecting Part (i) IDUs distribution by age
PDU	PDU-105. Studies of IDU providing information on sample structure by age and years injecting Part (ii) IDUs distribution by years injecting