Studies of OTC NRT versus prescription NRT
| Study | Product | n | Randomised | Visits | Follow up (months) | Outcome | Biochemical verification |
|---|---|---|---|---|---|---|---|
| Korberly et al33 | Patch | 3235 | Yes | 5 | 12 | Prolonged abstinence | Yes |
| Leischow et al34 | Patch | 300 | Yes | 5 | 12 | Continuous abstinence | Yes |
| Shiffman et al32 | Patch | 2636 | No | 6 | 6 | Continuous abstinence | Yes |
| Shiffman et al32 | Gum | 3136 | No | 6 | 6 | Continuous abstinence | Yes |