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58, P .05). Conclusions The results of this study suggest that better preoperative mental health is associated with lower perceived preoperative disability and decreased severity of back and leg pain. In contrast to other studies, the present study was unable to demonstrate that preoperative mental health is predictive of improvement in PROs at any postoperative timepoint after MIS TLIF. Level of Evidence 3. Clinical Relevance These results suggest that surgeons should exercise care in assuming that patients with poorer preoperative mental health are infer