Table 4.

Prognostic variables in subgroup analysis

Demographic variables:

*Age < 40 years versus > 40 years

*Higher education versus lower education

*Non-physical versus physically demanding jobs

Anamnestic variables and neurological variables

*Quetelet index < 25 versus > 25

*Influence of sitting on complaints versus no influence

*Straight leg raising < 30° versus low-back pain

MRI variables

*Median versus mediolateral and lateral herniation

*High disc space versus low disc space

*Higher signal versus lower signal of disc on T2 weighted images

*Bud-herniation versus broad based herniation