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Table 1 Patient demographics and surgical data for patients operated for spinal stenosis and for degenerative spondylolisthesis

From: Follow-up score, change score or percentage change score for determining clinical important outcome following surgery? An observational study from the Norwegian registry for Spine surgery evaluating patient reported outcome measures in lumbar spinal stenosis and lumbar degenerative spondylolisthesis

  Spinal stenosis Degenerative spondylolisthesis
  N   N  
Age; Yr ± SD 3858 66 ± 11 617 67 ± 10
Female, no (%) 3859 1919 (50%) 617 444 (72%)
ASA level (1–4); Mean ± SD 3759 2.0 ± 0.6 608 2.0 ± 0.5
ASA level 1, no (%)   681 (18%) 82 (13%)  
ASA level 2, no (%)   2349 (61%) 429 (71%)  
ASA level 3, no (%)   753 (19%) 97 (16%)  
ASA level 4, no (%)   12(0.3%) 0  
Body Mass Index; Mean (SD) 3547 27 ± 4 560 27.0 ± 5
Smokers, no (%) 3808 877 (23%) 609 115 (19%)
Laminectomy, no (%) 3859 1024 (27%) 617 239 (39%)
Midline preserving decompression, no (%) 3859 2835 (73%) 617 378 (61%)
Fusion, no (%) 3859 214 (6%) 617 297 (48%)
ODI; Mean (SD) 3837 40 ± 15 617 41 ± 15
EQ-5D; Mean (SD) 3535 0.37 ± 0.32 564 0.34 ± 0.32
NRS leg pain; Mean (SD) 3559 6.6 ± 2.2 569 6.7 ± 2.2
NRS back pain; Mean (SD) 3597 6.4 ± 2.2 573 6.9 ± 2.1
  1. N number of patient with data for the evaluated parameter