| Country | Population examined | Author | Misuse rate |
| Patients in an ADHD treatment center | |||
| USA | 545 patients; with/without ADHD- diagnosis, with short- or long-acting stimulant medication and/or abuse of these agents and/or use of illegal or illicit stimulants; aged 13 or older; private ADHD treatment center in a suburb of Richmond, Virginia (data collection: unknown) | Bright, 2008 [49] | Lifetime prevalence: 14.3% general stimulants, of this number 25.9% MPH |
| Adults with prescription for methylphenidate | |||
| CAN | 66 adults with prescription for MPH; aged 18 or older (data collection: 2004/2005) | Darredeau et al., 2007 [50] | Lifetime prevalence: 29% |
| USA | 42 psychology students with a prescription for Ritalin or Adderall; large northeastern university; mean age: 20.7 (data collection: unknown) | Jardin et al., 2011 [51] | Lifetime prevalence: 45% general stimulants, of this number 31% MPH |