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Table 1 Assessment of quality of included studies

From: The usefulness of routine histopathology of bilateral nasal polyps – a systematic review, meta-analysis, and cost evaluation

Questions Yeh et al. 2014 Yaman et al. 2011 Arslan et al. 2010 Romashko et al. 2005 Busaba et al. 2005 Garavello et al. 2005
Clear definition of study population? Yes Yes Yes Yes Yes Yes
Clear definition of outcomes and outcome assessment? Yes Yes Yes Yes Yes Yes
Independent assessment of outcome parameters? No No No No No No
Sufficient duration of follow-up? N/A N/A N/A N/A N/A N/A
No selective loss during follow-up? N/A N/A N/A N/A N/A N/A
Important confounders and prognostic factors identified? No No No Yes Yes Yes
  1. N/A not applicable