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Table 1. Characteristics of patients at baseline. Median (range) age (years)
Male sex
Median (range) duration of intermittent neurogenic claudication (months)
Median (range) body mass index*
Duration of back pain (categorized)
IPD patient’s preferred treatment†
Bony decompression patient’s preferred treatment† No preference for specific treatment†
Mild paresis or sensory loss Localization of stenosis:
L2-L3 L3-L4 L4-L5
Operated at two levels: L2-L3-L4
L2-L3 and L4-L5
L3-L4-L5
Zurich Claudication Questionnaire‡:
Mean (SD) subscale symptom severity 0-5 scale‡
Mean (SD) subscale physical function 0-4 scale‡ Mean (SD) Roland Disability Questionnaire 23 points Mean (SD) VAS leg pain (mm)§
Mean (SD) VAS back pain (mm)§
Median (range) SWT (m)¶
Completed SWT¶
66 (45-83) 49 (61) 12 (2-120)
27 (20-48) 1-3 years 39 (49) 0 (0) 41 (51) 54 (67)
2 (3) 25 (31) 53 (66) 21 (26) 2 (3) 1 (1) 17 (21)
3.1 (0.5)
2.6 (0.5)
13.0 (5.2)
52 (24)
60 (44)
180 (20-1260) (n=70) 8 (10)
64 (47-83) 37 (47) 22 (1-204)
28 (20-37) 1-3 years 36 (46) 3 (4) 40 (50) 56 (71)
3 (4) 22 (28) 54 (68) 16 (20) 3 (4) 0 (0) 13 (16)
3.2 (0.5)
2.6 (0.5)
14.4 (4.5)
58 (24)
49 (25)
140 (10-1220) (n=70) 13 (16)
Felix: one-year results and subgroups
Characteristic
IPD group (n=80)
Decompression group (n=79)
IPD=interspinous process device; SWT=shuttle walking distance; VAS=visual analogue scale.*Weight in kilograms divided by square of height in meters. †Patients were asked if they had any treatment preference (no preference, IPD, or bony decompression). ‡Disease specific outcome score; at baseline, score was reported in two subdo- mains—symptom severity (range 0-5) and physical function (range 0-4). §Intensity of pain was measured by hor- izontal 100 mm VAS, with 0 representing no pain and 100 worst pain ever. ¶Obtained before operation; patients were asked to walk until they got symptoms; test was scored “complete” when patients walked 1200 m in 15 min without stopping.
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