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Table 1 Summary of risk of bias assessment of randomized controlled trials

From: Propofol vs. inhalational agents to maintain general anaesthesia in ambulatory and in-patient surgery: a systematic review and meta-analysis

Domain Low risk High risk Unclear
Random sequence generation 46% < 1% 53%
Allocation concealment 12% 30% 58%
Blinding of patients and personnel 17% 31% 53%
Blinding of outcome assessment 23% 23% 54%
Incomplete outcome data 96% < 1% 4%
Selective reporting 95% < 1% 4%