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Table 2 Assessment of quality among included studies

From: The effects of prophylactic cranial irradiation versus control on survival of patients with extensive-stage small-cell lung cancer: a meta-analysis of 14 trials

Studies

Year

Random

Allocation

Blinding

Selective reporting

Other bias

Slotman

2007

Y

N

N

N

NR

Toshiaki

2017

Y

N

N

N

NR

  

Selection

Comparability

Outcome

Shu

2016

Huang

2015

Bai

2015

Wu

2015

Salama

2016

Nicholls

2016

Rule

2015

Schild

2012

Sharma

2017

Chen

2016

Wang

2014

Adriana

2018

  1. Randomized trials were assessed by the method of Cochrane Handbook 5.1. Retrospective studies were assessed by NOS method. A study can be awarded a maximum of one star for each numbered item within the Selection and Outcome categories. A maximum of two stars can be given for Comparability, according to the instruction of NOS. Abbreviation: Y yes, N no, NR not reported