Fig. 5.

Summary ROC (SROC) curve of respiratory variations of inferior vena cava diameter for predicting fluid responsiveness. Each circle represents individual study estimates. The diamond is the summary point representing the average sensitivity and specificity estimates. The ellipses around this summary point are the 95% confidence region (dashed line) and the 95% prediction region (dotted line). The cutoff values of included studies are as follows: (1) Barbier 2004 [9], 18%; (2) Feissel 2004 [10], 12%; (3) Charbonneau 2014 [16], 21%; (4) Vignon 2017 [19], 8%; (5) Theerawit 2016 [17], 10%; and (6) Lu 2017 [18], 20.5%