Fig.7From: Risk factors for adjacent segment degeneration after posterior lumbar fusion surgery in treatment for degenerative lumbar disorders: a meta-analysisa The odds ratio (OR) estimate for the type of fusion (PLIF vs TLIP). b The odds ratio (OR) estimate for the type of graft (auto- vs allograft). c The odds ratio (OR) estimate for fusion to S1 (vs non-fusion to S1). CI = confidence interval, df = degrees of freedom, M-H = Mantel–HaenszelBack to article page