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Table 1 Quality of the studies used in the meta-analysis

From: The pemetrexed-containing treatments in the non-small cell lung cancer, is -/low thymidylate synthase expression better than +/high thymidylate synthase expression: a meta-analysis

Studies Selection(stars) Comparability(stars) Outcome(stars)
Bepler et al. [6] 4 2 3
Chang et al. [30] 3 2 3
Chen et al. [21] 4 2 3
Igawa et al. [31] 3 2 3
Park et al. [22] 3 2 3
Sun et al. [17] 4 2 3
Takezawa et al. [18] 3 2 3
Wang et al. [19] 3 2 3
  1. The Newcastle–Ottawa Quality Assessment Scale is composed of three categories, selection, comparability and outcome. Stars are awarded to high-quality elements and are used to compare study quality in a quantitative manner. There are four items in the Selection category and three items in the Outcome category; a study can be awarded one star for each item in these categories. A maximum of two stars can be given for comparability.