Fig. 4From: Comparison between oblique lumbar interbody fusion and posterior lumbar interbody fusion for the treatment of lumbar degenerative diseases: a systematic review and meta-analysisForest plot of preoperative (a) and postoperative (b) Oswestry Disability Indexes between OLIF and PLIF. CI confidence interval, IV inverse variance, df degrees of freedom, SD standard deviationBack to article page