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Table 2 Forward stepwise multiple linear regression analysis with β, standard error, P, and adjusted R2 values presented: predictive variables for range of motion towards the most restricted side during the flexion–rotation test (FRT) (n = 60)

From: Comparative analysis and diagnostic accuracy of the cervical flexion–rotation test

Variable

Coefficient (β)

Standard error

P

Constant

10.17

3.64

<0.001

Neck positions/movement provoke headache

10.83

2.55

<0.001

Neck symptoms precede headache

5.51

2.54

0.04

  1. Adjusted R2 = 0.44, R2 change for “Neck positions/movement provoke headache” = 0.41, R2 change for “Neck symptoms precede headache” = 0.04. Variables entered forward stepwise