Table 3.
Quality for cohort studies included in the human meta-analysis using the Newcastle-Ottawa Quality Assessment Scale.
| Studies | Selection | Comparability | Assessment of Outcome | Scores | |||||
|---|---|---|---|---|---|---|---|---|---|
| Author( year) | Representativeness of exposed cohort | Selection of Non- exposed cohort | Ascertainment of exposure | Demonstration that outcome of interest was not present at start of study | Comparability of cohorts in design and analysis | Assessment of outcome | Was follow-up long enough for outcomes to occur? | Adequacy of follow up | |
| Guarrera (2010) |
☆ | ☆ | ☆ | ☆ | ☆ | ☆ | 6 | ||
| Guarrera (2014) |
☆ | ☆ | ☆ | ☆ | ☆ | ☆ | 6 | ||
| Dutkowski (2015) |
☆ | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | 7 | |
| Ravikumar (2016) |
☆ | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | 7 | |
| Selzner (2016) |
☆ | ☆ | ☆ | ☆ | ☆ | ☆ | 6 | ||
| Bral (2017) |
☆ | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | 7 | |
| van Rijn (2017) |
☆ | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | 7 | |
| Nasralla (2018) |
☆ | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | 8 |