Table 2 Details of study quality evaluation via the NOS
Study | Representativeness of the patient | Selection of the controls | Ascertainment of intervention | Demonstration that outcome of interest was not present at the start of the study | Comparability age and gender | Comparability other factors | Assessment of outcome | Was follow-up long enough for outcomes to occur | Adequacy of follow-up of cohorts | Total |
|---|---|---|---|---|---|---|---|---|---|---|
Li | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 8 |
Guo | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 8 |
Wang | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 8 |
Wu | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Ma | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Zizek | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 8 |
Vijayaraman | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Hua | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Chen | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Vijayaraman | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |