Table 2 NOS quality scale for cohort studies
Study | Selection of cohort | Comparable | Outcomes | Score | |||||
|---|---|---|---|---|---|---|---|---|---|
Selection of the exposure | Selection of the nonexposure | Determination of exposure | Initially healthy subjects | Comparable between the cohorts | Outcome measurement method | Sufficient follow-up | Integrity of follow-up | ||
2006 Christer Axelsson | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
2012 Marcus Eng Hock Ong | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
2015 Sebastian Zeiner | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
2015 Ching-Kuo Lin | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
2016 David G. Buckler | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 6 |
2017 Kei Hayasida | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |