Fig. 2. Comparisons of ODI scores for functional improvement and VAS scores for back pain and leg pain between minimally invasive and open lumbar spinal fusion. Heterogeneity: ODI score [τ2=0.000; χ2=2.549, df=4 (p=0.636); I2=0.0%], VAS back pain [τ2=0.000; χ2=1.192, df=4 (p=0.879); I2=0.0%], and VAS leg pain [τ2=0.000; χ2=0.748, df=1 (p=0.387); I2=0.0%]. ODI, Oswestry Disability Index; VAS, visual analogue scale; df, degrees of freedom; CI, confidence interval.
