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Table 3 Quality assessment of eligible studies

From: Prognostic value of lymph node ratio in laryngeal and hypopharyngeal squamous cell carcinoma: a systematic review and meta-analysis

Study Inclusion and exclusion criteria Prospective/Retrospective Patient characteristics Tumor characteristics LNR measurements Endpoint Follow-up period Patients unavailable for statistical analysis Quality scale
Choi 2019 [12] 1 1 1 1 0 0 1 0 5
Ye 2018 [22] 1 1 1 1 0 1 1 1 7
Lo 2017 [15] 1 1 1 1 0 0 1 0 5
Suzuki 2016 [21] 1 1 1 1 0 1 1 0 6
Imre 2016 [19] 1 1 1 1 0 1 1 0 6
Ryu 2015 [16] 1 1 1 1 1 1 1 0 7
Kunzel 2015 [20] 1 1 1 1 1 1 1 0 7
Joo 2015 [14] 1 1 1 1 1 0 1 0 6
Hua 2015 [13] 0 1 1 1 0 0 1 0 4
Wang 2014 [28] 1 1 1 1 0 0 0 0 4
Yu 2013 [29] 1 1 1 1 0 0 1 0 5
Wang 2013 [27] 1 1 1 1 0 0 1 1 6
Grasl 2019 [18] 1 1 1 1 0 1 1 0 6
  1. LNR Lymph node ratio