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Table 2 NOS quality scale for cohort studies

From: A meta-analysis of the resuscitative effects of mechanical and manual chest compression in out-of-hospital cardiac arrest patients

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