Fig. 4From: Liberal or conservative oxygen therapy for ventilated patients in the ICU: a meta-analysis of randomized controlled trialsa The funnel plot for the death in final follow-up time. b The funnel plot for the ICU mortality. c The funnel plot for the length in ICU days. d The funnel plot for the mechanical ventilation-free days. LOT liberal oxygen therapy, COT conservative oxygen therapy, ICU intensive care unit, RR relative riskBack to article page