Fig. 2From: Pregnancy and appendicitis: a systematic review and meta-analysis on the clinical use of MRI in diagnosis of appendicitis in pregnant womenThe risk of bias in the studies conducted was measured by using the QUADAS-2 tool. The risk of bias shown in Eq. 2 of the above image model (MRI) of each diagram indicate the number and percentage of studies with high (red), medium (yellow), and low (green) risk of bias in the four groups of the QUADAS-2 toolBack to article page