Fig. 3

Forest plots showing analysis of studies describing the favorable outcome using Macnab's criteria (excellent and good)/Nurick (0–2) of the last postoperative follow-up to find differences between minimal and traditional groups (A). Egger’s test assessing no publication bias (B). Sensitivity analysis using a single-study-removal method (C). Forest plots showing pooled proportion of percentage change in the favorable outcome after removing studies (D)