Table 2 Summary of the quality assessment of the instruments
| Â | Reliability | Agreement | Validity | Responsiveness | Interpretability |
|---|---|---|---|---|---|
Muscle endurance of short neck flexors (9 articles) | + | ? | ? | 0 | 0 |
Manual muscle examination (1 article) | ? | 0 | 0 | 0 | 0 |
Craniocervical flexion test (4 articles) | - | ? | 0 | 0 | 0 |
Dynamometer (3 articles) | ? | 0 | 0 | 0 | 0 |
Timed weighted overhead test (1 article) | ? | 0 | 0 | 0 | 0 |
Cervical PILE test (2 articles) | + | ? | 0 | 0 | 0 |