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Table 2 NOS scores for six nonrandomized clinical controlled studies

From: Pedicle screw placement in spinal neurosurgery using a 3D-printed drill guide template: a systematic review and meta-analysis

Included studySelectionComparabilityOutcomeFinal score
Guo F 2017✩✩✩✩✩✩✩✩✩✩✩
Jiang L 2017✩✩✩✩✩✩✩✩✩✩✩✩✩✩
Liu K 2016✩✩✩✩✩✩✩✩✩✩✩✩✩
Pan Y 2018✩✩✩✩✩✩✩✩✩✩✩
Pu X 2018✩✩✩✩✩✩✩✩✩✩✩✩✩✩✩✩
Zhang Y 2015✩✩✩✩✩✩✩✩✩✩✩✩✩✩✩✩