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Table 1 Baseline demographic data for patients with lumbar spinal stenosis undergoing decompressive surgery. The patients are divided into four groups according to their preoperative Numeric Rating Scale (NRS) –score for lower extremity pain

From: Clinical outcome after surgery for lumbar spinal stenosis in patients with insignificant lower extremity pain. A prospective cohort study from the Norwegian registry for spine surgery

 

Group 1 NRS = 0–2 n = 154

Group 2 NRS = 3–5 n = 753

Group 3 NRS = 6–8 n = 1766

Group 4 NRS = 9–10 n = 528

p-value

Age Mean (SD)

62.5 (12.0)

63.0 (11.5)

62.8 (11.0)

64.8 (12.0)

p < 0.05a

Sex % men

62.3

61.2

49.6

30.9

p < 0.05b

Smoke %

22.2

23.7

27.7

29.8

p < 0.05b

BMI Mean (SD)

27.3 (4.2)

27.2 (4.2)

27.3 (4.3)

26.8 (4.4)

p = 0.27a

ODI-score Mean (SD)

25.9 (15.2)

31.3 (12.3)

39.3 (13.2)

52.5 (15.1)

p < 0.05a

Back-pain (NRS) Mean (SD)

3.6 (2.7)

4.8 (1.8)

6.6 (1.7)

8.5 (1.9)

p < 0.05a

EQ-5D-score Mean (SD)

0.60 (0.28)

0.55 (0.25)

0.36 (0.31)

0.12 (0.26)

p < 0.05a

Number of levels Mean (SD)

1.4 (0.7)

1.3 (0.6)

1.8 (0.6)

1.3 (0.5)

p = 0.07a

  1. a = ANOVA-test. B = Pearsons Chi-test