Table 3.
Quality assessment of cohort studies.
| Author, year | Selection | Comparability | Outcome | Total quality score | |||||
|---|---|---|---|---|---|---|---|---|---|
| (1) Representativeness of the exposed cohort | (2) Selection of the non-exposed cohort | (3) Ascertainment of exposure | (4) Demonstration that outcome of interest was not present at start of study | (1) Comparability of cohorts on the basis of the design or analysis a | (1) Assessment of outcome | (2) Was follow-up long enough for outcomes to occur? | (3) Adequacy of follow up of cohorts | ||
| Kim HJ, 2013 | ★ | ★ | ★ | ★★ | ★ | ★ | 7 | ||
| Zaman SU, 2018 | ★ | ★ | ★ | ★ | 4 | ||||
| Kim SH, 2015 | ★ | ★ | ★ | ★ | ★ | ★ | 6 | ||
| Tresallet C, 2014 | ★ | ★ | ★ | ★ | ★ | 5 | |||
| Kim SK, 2016 | ★ | ★ | ★ | ★★ | ★ | ★ | 7 | ||
| Wu C, 2017 | ★ | ★ | ★ | ★★ | ★ | ★ | 7 | ||
| Feng JW, 2019 | ★ | ★ | ★ | ★★ | ★ | ★ | 7 | ||
| Harari A, 2012 | ★ | ★ | ★ | ★★ | ★ | ★ | 7 | ||
| Liu Z, 2015 | ★ | ★ | ★ | ★★ | ★ | ★ | 7 | ||
| Choi JS, 2014 | ★ | ★ | ★ | ★★ | ★ | ★ | 7 | ||
| Li CL, 2020 | ★ | ★ | ★ | ★★ | ★ | ★ | 7 | ||
a
A maximum of 2 stars can be awarded for this item. A study controlling for age receives one star, and a study controlling for other major risk factors receives an additional star.