PSYCHOMETRIC PROPERTIES OF THE NUMERIC PAIN-RATING SCALE AND NECK DISABILITY INDEX IN PATIENTS WITH CERVICOGENIC HEADACHES

CORA Physical Therapy, Tybee Island, Georgia; Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, University Rey Juan Carlos, Madrid, Spain; American Academy of Manipulative Therapy, Montgomery, Alabama; Franklin Pierce University, Concord, New Hampshire