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Table 2 Study assessment using the Newcastle-Ottawa Scale

From: Inducible nitric oxide synthase and systemic lupus erythematosus: a systematic review and meta-analysis

StudyPatient selectionComparabilityExposureTotal stars
Belmont 1997 [32]4*1*2*7*
Kuhn 1998 [22]3*1*1*5*
Gong 2002 [33]4*1*1*6*
Xu 2003 [34]3*1*2*6*
Zheng 2006 [35]4*1*1*6*
Bollain 2009 [36]4*1*2*7*
  1. * indicates item achieves 1piont in Newcastle-Ottawa Scale