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Table 2 Risk-of-bias summary of randomized clinical trials

From: Meta-analysis of studies comparing conservative treatment with antibiotics and appendectomy for acute appendicitis in the adult

Reference Styrud J 2006 Hansson J 2009 Vons C 2011 Mentula P 2015 Salminen P 2015
Random sequence generation + + + + +
Allocation concealment + + + + +
Blinding of participants and personnel
Blinding of outcome assessment + + + +
Incomplete outcome data + + + /
Selective reporting / / / / /
Other bias / / / / /
  1. +: low risk of bias
  2. -: high risk of bias
  3. /: unclear risk of bias