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Table 1 Basic information of studies included in this meta-analysis

From: Two-dose varicella vaccine effectiveness in China: a meta-analysis and evidence quality assessment

Author Study Year Study Design Study Setting, Range of Age/Average Age Participants Outbreak or Not Selectionb Comparabilityb Outcomeb Total Scoreb
Li Lu 2012 Retrospective cohort Elementary school, 5–8 y 8 Y 3 2 3 8
Pang Hong 2011–2012 Retrospective cohort Elementary school, 6–12 ya 123 Y 3 1 3 7
Sui Haitian 2015 Retrospective cohort Elementary school, 6–12 ya 234 Y 1 1 2 4
Zhu Qi 2014–2015 Retrospective cohort Kindergarten and elementary school, 5–10 ya 325 Y 3 1 3 7
Wei Yujia 2015 Retrospective cohort Elementary school, 8 y 65 Y 3 1 3 7
Xingqiang Pan 2009–2016 Retrospective cohort Community, 3–8 ya 83,481 N 4 0 3 7
Sun Yuan 2016 Retrospective cohort Elementary school, 7–12 y 817 Y 3 1 3 7
Wang Xu 2016 Retrospective cohort Elementary school, 9–12 y 763 Y 3 1 3 7
Cai Jintang 2015–2016 Prospective cohort Community, 2–6 y 79 N 3 2 1 6
Chen Jinsheng 2017 Retrospective cohort Elementary school, 6–12 y 569 Y 3 1 3 7
Ni Zhaorong 2017–2018 Retrospective cohort Elementary school, 6–12 ya 516 Y 2 1 2 5
Zhuang Lin 2018 Retrospective cohort Elementary school, 6–11 y 216 Y 3 1 3 7
  1. aOur estimate; age range not provided in the publication
  2. bSelection (maximum:four stars); Comparability (maximum:two stars); Outcome (maximum:three stars); Total score (maximum:nine stars)