Other questions in this quiz

2. Different questions were used each time an interview took place

  • False
  • True

3. What was their mean age?

  • 19
  • 30
  • 23
  • 45

4. 106 participants had...

  • stopped using cocaine by the end of the study
  • increased their heroin intake by the end of the study

5. 147 participants had...

  • reduced their cocaine use
  • doubled their cocaine use

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