Fig. 8. Comparison of hospital stay, operation time, and radiation exposure time between minimally invasive and open lumbar spinal fusion. Heterogeneity: hospital stay [τ2=0.236; χ2=26.011, df=5 (p<0.0001); I2=80.8%], operation time [τ2=0.297; χ2=40.069, df=6 (p<0.0001); I2=85.0%], and radiation exposure time [τ2=0.240; χ2=14.309, df=3 (p=0.003); I2=79.0%]. df, degrees of freedom; CI, confidence interval.
