Table 5. Treatment effect of surgery for lumbar disk herniation⁵⁴ .

Outcome	1 y	4 y
SF-36 bodily pain
BMI < 30 kg/m2	13.4	16.5
BMI > 30 kg/m2	17.5	13.3
p	0.18	0.35
SF-36 physical function
BMI < 30 kg/m2	14.8	15.7
BMI > 30 kg/m2	19	14.3
p	0.13	0.64
ODI
BMI < 30 kg/m2	−13.3	−14
BMI > 30 kg/m2	−18.5	−12.3
p	0.021	0.50

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