Table 3. Treatment effect of surgery for lumbar stenosis²⁸ .

Outcome	1 y	4 y
SF-36 bodily pain
BMI < 30 kg/m2	14.6	12.6
BMI > 30 kg/m2	17.2	15.9
p	0.47	0.44
SF-36 physical function
BMI < 30 kg/m2	13.5	7.4
BMI > 30 kg/m2	16.3	12.8
p	0.40	0.17
ODI
BMI < 30 kg/m2	−10.1	−7.4
BMI > 30 kg/m2	−15.7	−13.9
p	0.036	0.037

Abbreviations: BMI, body mass index; ODI, Oswestry Disability Score; SF-36, Short Form-36.