ASA = American Society of Anesthesiologists; ASD = adult spinal deformity; EBL = estimated blood loss; HRQOL = health-related quality of life; JOA = Japanese Orthopaedic Association; LBP = low-back pain; LL = lumbar lordosis; LSS = lumbar spinal stenosis; MCS = Mental Component Summary; NRS = numeric rating scale; PCS = Physical Component Summary; PI = pelvic incidence; PI-LL = PI − LL mismatch; PT = pelvic tilt; RMDQ = Roland-Morris Disability Questionnaire; SF-8 = 8-item Short Form Health Survey; SVA = sagittal vertical axis; ZCQ = Zurich Claudication Questionnaire; decompression surgery without fusion; health-related quality of life; lumbar lordosis; lumbar spinal stenosis; pelvic incidence; post-B = postoperative sagittal balance; post-I = postoperative sagittal imbalance; pre-B = preoperative sagittal balance; pre-I = preoperative sagittal imbalance; sagittal spinopelvic alignment; sagittal vertical axis; surgical outcome