Table 5 The explained variance (Adjusted R²) between baseline outcome variables, predictors and NDI, EQ-5D or pain intensity as outcome after 12 weeks explored by linear regression analysis

Baseline outcome variables/Model

Adjusted R²

Adjusted R²

Adjusted R²

Baseline pain intensity (only Block 5a)

0.11

0.11

0.05

Baseline NDI (only Block 5b)

0.19

0.53

0.26

Baseline EQ-5D (only Block 5c)

0.11

0.26

0.34

Final model (Block 1 to 4), no baseline variable

0.22

0.37

0.21

Final model and baseline pain intensity (Block 1 to 5a)

0.25

0.39

0.22

Final model and baseline NDI (Block 1 to 5b)

0.27

0.60

0.31

Final model and baseline EQ-5D (Block 1 to 5c)

0.25

0.47

0.42