Table 1 Correlation Matrix evaluating Association of predictor variables: nominal measures were calculated using Cramer’s V, continuous to nominal measures were calculated using a Biserial correlation, whereas continuous measures were analyses using Pearson Product correlations

Clinician prediction of prognosis

Duration

0.41 P = 0.51

Previous injury

0.28 P = 0.36

0.31 P = 0.95

Pain baseline

0.20 P = 0.03

−0.09 P = 0.30

−0.20 P = 0.84

Oswestry/Neck disability baseline

0.27 P < 0.01

−0.03 P = 0.75

−0.46 P = 0.64

0.46 P < 0.01

Age

0.19 P = 0.03

−0.20 P = 0.84

−0.05 P = 0.61

−0.04 P = 0.69

0.17 P = 0.08

Within session change

0.48 P < 0.01

0.47 P = 0.18

0.01 P = 0.94

0.28 P < 0.01

0.29 P < 0.01

−0.06 P = 0.55

Psychological factor

0.18 P = 0.87

0.41 P = 0.49

0.05 P = 0.59

0.10 P = 0.29

0.09 P = 0.34

0.02 P = 0.85

0.01 P = 0.91