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Variable n (%)a Age, y, mean (SD) 44.1 (10.5) BMI, mean (SD) 27.8 (5.7) Sex Female 158 (44.0%) Male 201 (56.0%) Surgery type ALIF 95 (26.5%) TDR 238 (66.3%) Hybrid 26 (7.2%) Number of levels 1 256 (71.3%) 2 94 (26.2%) 3 9 (2.5%) Abbreviations: ALIF, anterior lumbar interbody fusion; BMI, body mass index; TDR, total disc replacement.
↵a Data presented as n (%) except where otherwise noted.