Table 2. Internal Validity (PEDro 15 Criteria and Scores) of the Selected Studies (n = 08).
| Study | Random Allocation | Concealed Allocation | Group Similar at Baseline | Participant Blinding | Therapist Blinding | Assessor Blinding | <15% Drop Outs | Intention-to-Treat Analysis | Between Groups Difference Reported | Point Estimate and Variability Reported | Total Score (0 to 10) |
| De Bruyn et al. 2020 23 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 7 |
| Umeki N et al. 2019 22 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 3 |
| Arya et al. 2018 18 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 7 |
| Azad A et al. 2018 19 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 3 |
| Salles L et al. 2017 16 | 1 | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 6 |
| Samaei A et al. 2016 21 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 4 |
| de Diego C et al. 2013 17 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 6 |
| Chanubol R et al. 2012 20 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 8 |