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Table 1 Contribution of the original studies to the investigation of the individual cephalometric variables
| Studya | Sum of studies | Sum of separate treated groups | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Abdelnaby and Nassar, 2010a [[10]] | Abdelnaby and Nassar, 2010b [[10]] | Altuğ et al., 1989[[16]] | Barrett et al., 2010a[[9]] | Barrett et al., 2010b[[9]] | Gökalp and Kurt, 2005[[11]] | Tuncer et al., 2009[[13]] | |||
| Force level of the chin cup | Heavy | Light | Not specified | Light | Light | Heavy | Light | ||
| Additional appliance used | Bite plane | Bite plane | No | No | Quad helix | No | Bite plane | ||
| SNA (°) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | 5 | 7 |
| SNB (°) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | 5 | 7 |
| ANB (°) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | 5 | 7 |
| Wits appraisal (mm) | Yes | Yes | Yes | Yes | Yes | No | No | 3 | 5 |
| Co-Gn (mm) | No | No | No | Yes | Yes | Yes | Yes | 3 | 4 |
| SN-ML (°) | Yes | Yes | Yes | No | No | Yes | Yes | 3 | 5 |
| Gonial angle (°) | Yes | Yes | Yes | Yes | Yes | Yes | No | 4 | 6 |
| N-Me (mm) | Yes | Yes | No | No | No | No | Yes | 2 | 3 |
| UFH (mm) | No | No | No | Yes | Yes | No | Yes | 2 | 3 |
| LAFH (mm) | No | No | No | Yes | Yes | No | Yes | 2 | 3 |
| Co-Go (mm) | No | No | No | Yes | Yes | Yes | No | 2 | 3 |
| Overjet (mm) | No | No | No | Yes | Yes | Yes | No | 2 | 3 |
| Overbite (mm) | No | No | No | Yes | Yes | Yes | No | 2 | 3 |
