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Table 3 The Newcastle-Ottawa Scale (NOS) quality assessment of the eligible studies in the meta-analysis

From: Prognostic value of cervical nodal necrosis on staging imaging of nasopharyngeal carcinoma in era of intensity-modulated radiotherapy: a systematic review and meta-analysis

First author Year of publication Selection Comparability Outcome Total score
Representativeness of the exposed cohort
(0 - 1)
Selection of the non-exposed cohort
(0 -1)
Ascertainment of exposure
(0 -1)
Demonstration that outcome of interest was not present at start of study
(0 -1)
Comparability of cohorts on the basis of the design or analysis
(0 -2)
Assessment of outcome
(0 -1)
Was follow-up long enough for outcomes to occur
(0 -1)
Adequacy of follow up of cohorts
(0 -1)
CNN presence/absence in any nodal group
Li [19] 2013 1 1 0 1 2 1 1 1 8
Zhang [20] 2017 1 1 1 1 2 0 1 1 8
Zhou [21] 2018 1 1 1 1 2 0 1 1 8
Feng [22] 2019 1 1 1 1 2 0 1 1 8
Ai [23] 2019 1 1 1 1 2 1 1 1 9
Xu [24] 2021 1 1 0 1 2 0 1 1 7
CNN presence/absence in retropharyngeal nodes
Tang [25] 2020 1 1 0 1 2 1 1 1 8
CNN grades
Zhang [26] 2021 1 1 1 1 2 1 1 1 9
CNN laterality
Xie [27] 2021 1 1 1 1 2 1 1 1 9