Fig. 13.  Hospital length of stay (in days). *= indirect comparison; p = posterior probability of the treatment effect given the data; ++= when the study number was designed with two intervention groups and one comparison group, the number of patients in the comparison group was equally divided into two comparison groups. CFNB = continuous femoral nerve block; Epidural = epidural nerve block; PCA = patient-controlled analgesia; Sciatic = sciatic nerve block; SSFNB = single-shot femoral nerve block.