Reliability and validity of Oswestry Disability Index among patients undergoing lumbar spinal surgery

BMC Surgery

Table 2 Descriptive characteristic of the sample

Variables	Mean	Standard deviation
Age, years	58.5	15.8
Body mass index (BMI), kg/m²	28.5	5.0
Back pain severity, points	60.4	26.8
Oswestry disability Index, points	43.4	17.4
Pain duration before surgery	N	%
< 6 weeks	118	8
6–12 weeks	196	13
3–12 months	487	33
> 12 months	681	46

ISSN: 1471-2482