Manual therapy
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Passive intervertebral motion of the cervical spine was assessed independently by two physical therapists. The therapists had equal backgrounds concerning education and clinical experience. ⋯ Data were analysed by percentage agreement and kappa coefficient which indicates inter-examiner reliability greater than expected by chance. Results demonstrated inter-examiner reliability of between 70 and 87% and kappa coefficients ranging between 0.28 and 0.43 considered to be only 'fair to moderate'.