Table 2 The NOS score of the study
Study | Representativeness of the intervention cohort | Selection of the nonintervention cohort | Ascertainment of intervention | Demonstration that outcome of interest was not present at start of study | Comparability of cohorts on the basis of the design or analysis | Assessment of outcome | Was follow up long enough for outcomes to occur | Adequacy of follow up of cohorts | score |
|---|---|---|---|---|---|---|---|---|---|
Liu Y. 2004 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 7 |
Habib AN. 2006 | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 1 | 8 |
Kilpatrick RDl. 2007 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Chmielewski M. 2011 | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 1 | 8 |
Shoji T. 2011 | 1 | 1 | 0 | 1 | 2 | 1 | 0 | 1 | 7 |
Sameiro-Faria MD.2013 | 1 | 1 | 0 | 1 | 2 | 1 | 0 | 1 | 7 |
Yang WL. 2016 | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 1 | 8 |
Park CH. 2017 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
Chang TI. 2018 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
Nakano T. 2020 | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 1 | 8 |
Yu J. 2021 | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 1 | 8 |