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Table 2 Quality assessment of cohort studies according to the Newcastle Ottawa Scale (NOS)

From: Comparison of outcomes between cortical screws and traditional pedicle screws for lumbar interbody fusion: a systematic review and meta-analysis

Author Selection Comparability Exposure Total score
Hoffman et al. 2 2 3 7
Marengo et al. 3 2 3 8
Takenaka et al. 2 2 3 7
Sakaura et al. 3 2 3 8
Chin et al. 3 2 3 8
Sakaura et al. 3 2 3 8
Orita et al. 3 2 2 7
Hung et al. 3 2 3 8
Ninomiya et al. 3 2 2 7
Peng et al. 3 2 3 8