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Table 1 Comparison of the baseline data

From: Complications rate of and risk factors for the unplanned reoperation of degenerative lumbar spondylolisthesis in elderly patients: a retrospective single-Centre cohort study of 33 patients

  Posterolateral fusion Intervertebral fusion P value
Patients (n) 24 (24/650) 9 (9/450)  
Males/females 9/15 3/6  
Mean age (y) 72.80 ± 11.7 71.90 ± 10.7 0.583
Follow-up (y) 4.20 ± 2.25 4.32 ± 2.54 0.654
Involved levels
 L4–5 18 5 < 0.0001
 L5-S1 6 4 < 0.0001
Hospital stay (days) 12.55 ± 3.35 15.43 ± 5.20 < 0.0001
Surgery time (minutes) 100.50 ± 30.50 150.50 ± 25.50 < 0.0001
Blood loss (ml) 150.65 ± 35.45 230.90 ± 101.50 < 0.0001
Wound infection 4 3 0.730
Screw misplacement 7 3 < 0.0001
Neurological deficit 5 1 < 0.0001
Nonunion 4 1 < 0.0001
Screw fracture 4 1 < 0.0001
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