Table 2 Quality of the studies utilizing the Newcastle-Ottawa quality assessment scale (Cohort studies)
Reference (Year) | Selection | Comparability | Outcome | ||||||
|---|---|---|---|---|---|---|---|---|---|
Representativeness of exposed cohort | Selection of the non-exposed cohort | Ascertainment of exposure | Demonstration outcome was not present at start of study | Comparability of cohorts on the basis of the design or analysis | Assessment of outcome | Follow up long enough | Adequacy of follow up of cohorts | Total score | |
Kong (2017) | \(\bigstar\) | \(\bigstar\) | \(\bigstar\) | \(\bigstar\) | \(\bigstar\) | \(\bigstar\) | 6 | ||
Xiao (2021) | \(\bigstar\) | \(\bigstar\) | \(\bigstar\) | \(\bigstar\) | \(\bigstar \bigstar\) | \(\bigstar\) | \(\bigstar\) | 8 | |