Table 1 Types of control interventions
Intervention type | Multiple session studies | Single session studies |
|---|---|---|
Placebo: drug only | 1 | 0 |
Placebo: non-manual therapy | 1 | 1 |
Placebo: drug + sham manual therapy | 1 | 0 |
Manual thrust at alternate site (randomly different [30], contralateral [32], ineffective site [33]) | 1 | 2 |
Manual contact: no thrust | 2 | 10 |
Low level manual therapy | 1 | 0 |
Low level non-manual therapy only | 0 | 0 |
Low level manual + non-manual therapy | 1 | 0 |
Waiting list | 1 | 0 |