Author | Study Design | Reporting | External Validity | ||||||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | Â | ||
 Dujin, P., Jeonghee, K., & Hyunok, L. | Randomised Controlled Trial | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 1 |  |
 Hewitt, B., & Shakespeare, D. | Prospective non-randomised controlled trial (Quasi-Experimental) | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |  |
 Kim, T., Park, K., Yoon, S., Kim, S., Chang, C., & Seong, S. | Randomised Controlled Crossover Trial | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 |  |
 Pongkunakorn, A., & Sawatphap, D | Prospective non-randomised controlled trial (Quasi-Experimental) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 |  |
Author | Internal Validity Bias | Internal Validity Confounding | Power | Total Score | |||||||||||
14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | Â | |
 Dujin, P., Jeonghee, K., & Hyunok, L. | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 20 |
 Hewitt, B., & Shakespeare, D. | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 18 |
 Kim, T., Park, K., Yoon, S., Kim, S., Chang, C., & Seong, S. | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 22 |
 Pongkunakorn, A., & Sawatphap, D | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 20 |